Merge branch 'release/2.12.4' into develop
Support for arrow functions and default argument values in Javascript (ES6)
Support for rest params; Generator functions don't return, they `@yield`
Add support for destructured parameters
Adds support for method initializer shorthand
Update readme for es6, fix some broken formatting, add link to contibutors.md
Merge pull request #333 from spadgos/es6

Es6 support
Fix broken link in readme
Version bump and history
Merge branch 'release/2.13.0'