Implement agent_info tests; better mocks
Merge pull request #2504 from BrindleFly/master

Fixing defect with handling of multiple <item>
Cleaned up agent_tests
[aws|elb] compact possible nil

forces jruby/1.8 to behave more like 1.9+
[google] Excon::Errors::NotFound never reaches the models

Use Fog::Errors::NotFound as raised by build_excon_response
Merge pull request #2503 from maestrodev/google-not-found

[google|compute] Rescue from Fog::Errors::NotFound instead of Excon
fix error - invalid excon request keys: :host
make test output more verbose if provider service is unavailable
mock tests doesn't have to rely on provider availability
Merge pull request #2505 from nathwill/fix-bluebox-excon-host-error

fix error - 'invalid excon request keys: :host' for bluebox
Merge pull request #2508 from allomov/test-more-verbose

Make test output more verbose if Provider is not available for live tests.
Add Ruby 2.1.0 to the test matrix
Merge pull request #2511 from petergoldstein/feature/add_ruby_2_1_0_to_travis

Add Ruby 2.1.0 to the test matrix
ignore more Ruby version manager files

Both rbenv and rvm now generate some files that have no bearing on
the project, and leave the local repo in a dirty state.
drop dependency on deprecated ruby-hmac gem, fixes #2034

Ruby 1.8 compiled against OpenSSL 0.9.8 supports SHA256 for some time now.
Ref: https://github.com/ruby/ruby/blob/ruby_1_8_7/ChangeLog#L12025-L12029
Merge pull request #2512 from miketheman/ignore_ruby_managers

ignore more Ruby version manager files
[AWS|EC2] request_spot_instances.rb requires that date parameters be iso8601
[AWS|EC2] fix sporadically failing network_acl_tests.rb
[digitalocean|compute] add created_at timestamp as attribute of server

* We receive this field from Digital Ocean, so all we need to do to use it is add it as an attribute and it just works
[digitalocean|compute] additional test coverage and some maintenance

* Add created_at field to mock response
* Assert that the created_at field is returned
* Update references to nonexistent images