Add Behat Feature support

+ Close #102
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
Apply native key bindings to input in options view
Merge pull request #106 from rgbkrk/copy_paste_input_options

Apply native key bindings to input in options view
Update CHANGELOG
Prepare 2.3.4 release