Add Behat Feature support

+ Close #102
Update CHANGELOG
Update contributor ordering
Prepare 2.3.2 release
Merge pull request #103 from erran/behat-feature-support

Add Behat Feature support
Update README with Behat
Alphabetize grammars.
More keywords
Update CHANGELOG
Merge pull request #105 from rgbkrk/updates

Updates
Prepare 2.3.3 release