Add support for TeamCity report formatter

RubyMine uses the TeamCity reporter formatter and requires
the execution result of the example.
Update README

The gem should not be required by Bundler for several reasons:
* We are requiring it manually in spec_helper.rb
* Because Flowaker depends on rspec already being required, if Bundle
  requires it first, then the test environment will not load with the
  following error:
  undefined method `configuration' for RSpec:Module (NoMethodError)'
More robust stand-in for Rspec example
Merge pull request #1 from bbuchalter/master

Add support for TeamCity report formatter