Add vcr testing to fix koji diff not using latest package version

Adding vcr enables testing and fixing a bug in Koji.diff:

Koji.diff should show the "latest" rpm version for each tag.
Previously, the f19-ruby tag had rubygem-sinatra packages for 1.3.4 and 1.3.5 versions.
Koji.diff reported 1.3.4 for the f19-ruby tag while most users would expect 1.3.5.
Note: this should be set to false as soon as we fix the remaining tests that hit rubygems.org directly.

It appears to be limited to only Polisher::Git::Pkg#build_srpm, it's doing a:

`GET https://rubygems.org/gems/-.gem`

See below, when I turn this value to `false` locally:
```
  1) Polisher::Git::Pkg#build_srpm uses package command to build srpm
     Failure/Error: pkg.build_srpm
     VCR::Errors::UnhandledHTTPRequestError:


       ================================================================================
       An HTTP request has been made that VCR does not know how to handle:
         GET https://rubygems.org/gems/-.gem

       There is currently no cassette in use. There are a few ways
       you can configure VCR to handle this request:

         * If you're surprised VCR is raising this error
           and want insight about how VCR attempted to handle the request,
           you can use the debug_logger configuration option to log more details [1].
         * If you want VCR to record this request and play it back during future test
           runs, you should wrap your test (or this portion of your test) in a
           `VCR.use_cassette` block [2].
         * If you only want VCR to handle requests made while a cassette is in use,
           configure `allow_http_connections_when_no_cassette = true`. VCR will
           ignore this request since it is made when there is no cassette [3].
         * If you want VCR to ignore this request (and others like it), you can
           set an `ignore_request` callback [4].

       [1] https://www.relishapp.com/vcr/vcr/v/2-4-0/docs/configuration/debug-logging
       [2] https://www.relishapp.com/vcr/vcr/v/2-4-0/docs/getting-started
       [3] https://www.relishapp.com/vcr/vcr/v/2-4-0/docs/configuration/allow-http-connections-when-no-cassette
       [4] https://www.relishapp.com/vcr/vcr/v/2-4-0/docs/configuration/ignore-request
       ================================================================================
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/vcr-2.4.0/lib/vcr/request_handler.rb:97:in `on_unhandled_request'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/vcr-2.4.0/lib/vcr/library_hooks/webmock.rb:112:in `on_unhandled_request'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/vcr-2.4.0/lib/vcr/request_handler.rb:24:in `handle'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/vcr-2.4.0/lib/vcr/library_hooks/webmock.rb:127:in `block in <module:WebMock>'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/stub_registry.rb:28:in `call'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/stub_registry.rb:28:in `block in register_global_stub'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/request_pattern.rb:35:in `call'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/request_pattern.rb:35:in `matches?'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/stub_registry.rb:58:in `block in request_stub_for'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/stub_registry.rb:57:in `each'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/stub_registry.rb:57:in `detect'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/stub_registry.rb:57:in `request_stub_for'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/stub_registry.rb:50:in `response_for_request'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/http_lib_adapters/curb_adapter.rb:62:in `curb_or_webmock'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/http_lib_adapters/curb_adapter.rb:199:in `perform'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/http_lib_adapters/curb_adapter.rb:175:in `http'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/http_lib_adapters/curb_adapter.rb:175:in `http'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/curb-0.8.5/lib/curl/easy.rb:284:in `http_get'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/http_lib_adapters/curb_adapter.rb:181:in `block (2 levels) in <class:WebMockCurlEasy>'
     # ./lib/polisher/gem.rb:198:in `download_gem'
     # ./lib/polisher/gem.rb:222:in `downloaded_gem_path'
     # ./lib/polisher/gem.rb:228:in `downloaded_gem_path'
     # ./lib/polisher/gem.rb:233:in `gem_path'
     # ./lib/polisher/git/pkg.rb:197:in `block in build_srpm'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/message_expectation.rb:485:in `call'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/message_expectation.rb:485:in `block in call'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/message_expectation.rb:481:in `each'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/message_expectation.rb:481:in `call'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/message_expectation.rb:519:in `block in call'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/message_expectation.rb:518:in `map'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/message_expectation.rb:518:in `call'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/message_expectation.rb:186:in `invoke'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/proxy.rb:151:in `message_received'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/method_double.rb:174:in `in_repo'
     # ./lib/polisher/git/pkg.rb:193:in `build_srpm'
     # ./spec/git_spec.rb:359:in `block (3 levels) in <module:Polisher>'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example.rb:114:in `instance_eval'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example.rb:114:in `block in run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example.rb:254:in `with_around_each_hooks'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example.rb:111:in `run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:390:in `block in run_examples'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:386:in `map'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:386:in `run_examples'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:371:in `run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:372:in `block in run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:372:in `map'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:372:in `run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/command_line.rb:28:in `block (2 levels) in run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/command_line.rb:28:in `map'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/command_line.rb:28:in `block in run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/reporter.rb:58:in `report'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/command_line.rb:25:in `run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/runner.rb:80:in `run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/runner.rb:17:in `block in autorun'

  2) Polisher::Git::Pkg#build_srpm package command fails raises RuntimeError with the command stderr
     Failure/Error: expect { pkg.build_srpm }.to raise_error(RuntimeError, "cmd_error")
       expected RuntimeError with "cmd_error", got #<VCR::Errors::UnhandledHTTPRequestError:

       ================================================================================
       An HTTP request has been made that VCR does not know how to handle:
         GET https://rubygems.org/gems/-.gem

       There is currently no cassette in use. There are a few ways
       you can configure VCR to handle this request:

         * If you're surprised VCR is raising this error
           and want insight about how VCR attempted to handle the request,
           you can use the debug_logger configuration option to log more details [1].
         * If you want VCR to record this request and play it back during future test
           runs, you should wrap your test (or this portion of your test) in a
           `VCR.use_cassette` block [2].
         * If you only want VCR to handle requests made while a cassette is in use,
           configure `allow_http_connections_when_no_cassette = true`. VCR will
           ignore this request since it is made when there is no cassette [3].
         * If you want VCR to ignore this request (and others like it), you can
           set an `ignore_request` callback [4].

       [1] https://www.relishapp.com/vcr/vcr/v/2-4-0/docs/configuration/debug-logging
       [2] https://www.relishapp.com/vcr/vcr/v/2-4-0/docs/getting-started
       [3] https://www.relishapp.com/vcr/vcr/v/2-4-0/docs/configuration/allow-http-connections-when-no-cassette
       [4] https://www.relishapp.com/vcr/vcr/v/2-4-0/docs/configuration/ignore-request
       ================================================================================

       > with backtrace:
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/vcr-2.4.0/lib/vcr/request_handler.rb:97:in `on_unhandled_request'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/vcr-2.4.0/lib/vcr/library_hooks/webmock.rb:112:in `on_unhandled_request'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/vcr-2.4.0/lib/vcr/request_handler.rb:24:in `handle'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/vcr-2.4.0/lib/vcr/library_hooks/webmock.rb:127:in `block in <module:WebMock>'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/stub_registry.rb:28:in `call'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/stub_registry.rb:28:in `block in register_global_stub'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/request_pattern.rb:35:in `call'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/request_pattern.rb:35:in `matches?'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/stub_registry.rb:58:in `block in request_stub_for'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/stub_registry.rb:57:in `each'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/stub_registry.rb:57:in `detect'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/stub_registry.rb:57:in `request_stub_for'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/stub_registry.rb:50:in `response_for_request'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/http_lib_adapters/curb_adapter.rb:62:in `curb_or_webmock'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/http_lib_adapters/curb_adapter.rb:199:in `perform'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/http_lib_adapters/curb_adapter.rb:175:in `http'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/http_lib_adapters/curb_adapter.rb:175:in `http'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/curb-0.8.5/lib/curl/easy.rb:284:in `http_get'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/webmock-1.11.0/lib/webmock/http_lib_adapters/curb_adapter.rb:181:in `block (2 levels) in <class:WebMockCurlEasy>'
         # ./lib/polisher/gem.rb:198:in `download_gem'
         # ./lib/polisher/gem.rb:222:in `downloaded_gem_path'
         # ./lib/polisher/gem.rb:228:in `downloaded_gem_path'
         # ./lib/polisher/gem.rb:233:in `gem_path'
         # ./lib/polisher/git/pkg.rb:197:in `block in build_srpm'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/message_expectation.rb:485:in `call'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/message_expectation.rb:485:in `block in call'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/message_expectation.rb:481:in `each'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/message_expectation.rb:481:in `call'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/message_expectation.rb:519:in `block in call'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/message_expectation.rb:518:in `map'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/message_expectation.rb:518:in `call'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/message_expectation.rb:186:in `invoke'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/proxy.rb:151:in `message_received'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-mocks-2.14.4/lib/rspec/mocks/method_double.rb:174:in `in_repo'
         # ./lib/polisher/git/pkg.rb:193:in `build_srpm'
         # ./spec/git_spec.rb:375:in `block (5 levels) in <module:Polisher>'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-expectations-2.14.4/lib/rspec/matchers/built_in/raise_error.rb:40:in `call'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-expectations-2.14.4/lib/rspec/matchers/built_in/raise_error.rb:40:in `matches?'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-expectations-2.14.4/lib/rspec/expectations/handler.rb:24:in `handle_matcher'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-expectations-2.14.4/lib/rspec/expectations/expectation_target.rb:34:in `to'
         # ./spec/git_spec.rb:375:in `block (4 levels) in <module:Polisher>'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example.rb:114:in `instance_eval'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example.rb:114:in `block in run'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example.rb:254:in `with_around_each_hooks'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example.rb:111:in `run'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:390:in `block in run_examples'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:386:in `map'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:386:in `run_examples'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:371:in `run'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:372:in `block in run'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:372:in `map'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:372:in `run'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:372:in `block in run'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:372:in `map'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:372:in `run'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/command_line.rb:28:in `block (2 levels) in run'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/command_line.rb:28:in `map'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/command_line.rb:28:in `block in run'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/reporter.rb:58:in `report'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/command_line.rb:25:in `run'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/runner.rb:80:in `run'
         # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/runner.rb:17:in `block in autorun'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-expectations-2.14.4/lib/rspec/expectations/fail_with.rb:32:in `fail_with'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-expectations-2.14.4/lib/rspec/expectations/handler.rb:36:in `handle_matcher'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-expectations-2.14.4/lib/rspec/expectations/expectation_target.rb:34:in `to'
     # ./spec/git_spec.rb:375:in `block (4 levels) in <module:Polisher>'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example.rb:114:in `instance_eval'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example.rb:114:in `block in run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example.rb:254:in `with_around_each_hooks'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example.rb:111:in `run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:390:in `block in run_examples'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:386:in `map'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:386:in `run_examples'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:371:in `run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:372:in `block in run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:372:in `map'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:372:in `run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:372:in `block in run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:372:in `map'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:372:in `run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/command_line.rb:28:in `block (2 levels) in run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/command_line.rb:28:in `map'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/command_line.rb:28:in `block in run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/reporter.rb:58:in `report'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/command_line.rb:25:in `run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/runner.rb:80:in `run'
     # /Users/joerafaniello/.gem/ruby/1.9.3/gems/rspec-core-2.14.7/lib/rspec/core/runner.rb:17:in `block in autorun'
```