Support for arrow function

[pioug]

I would like to add support for ES6 arrow function.

As far as I know, the modification is not big since ArrowFunctionExpression and FunctionExpression structures are quite similar. The only difference I think of is the case of a body without curly brace like in x => x instead of x => { return x; }.

My little contributtion towards ES6 support https://github.com/olov/ng-annotate/issues/237

[olov]

https://github.com/olov/ng-annotate/issues/245

[schmod]

Fixed in babel-plugin-angularjs-annotate: https://github.com/schmod/babel-plugin-angularjs-annotate/commit/7cdc9c39be166ccd9ea208e83cdf91b613cdf55d

[olov]

245