Fixing mocha deprecation warning
Fixed incorrect test name
Cleaning up Gemfile

- moving development dependencies into gemspec
- adding appraisal
Adding Appraisal

- new appraisals file
- setting up with rails 3.2
Rails 4 support

- adding new appraisal for testing
- new config options for the test app
- headers interface changed to key?
- fixed removed assertions
Updating CI with new gemfiles

- the Appraisal generated gemfiles will be used by ci instead of the
default
Changelog and readme updated for Rails support