adding es6 module transpiler filter

[izhan]

Hi all,

This PR was suggested to me by the friendly Ember folks over at Yapp. The filter uses Square's ES6 Module Transpiler (https://github.com/square/es6-module-transpiler) through a Ruby gem I created (https://github.com/izhan/ruby_es6_module_transpiler). The gem is modeled closely after a Rails gem (https://github.com/izhan/es6_module_transpiler-rails) and will continue to be improved in the future. For an example of the filter in action, see https://github.com/izhan/rake-pipeline-tester.

I am open to suggestions for improving both this PR as well as the Ruby gem.

Thanks

[hjr3]

:+1:

[hjr3]

Leaving this open for a few more days to let people comment. Will merge at 7 days if no one has any concerns.

[izhan]

@hjr3 Thanks for the followup -- sounds good. I will continue updating the PR for any bugs or improvements I find.

[lukemelia]

@izhan can you provide an example in the testing app of setting the moduleName?

[lukemelia]

@izhan it would be convenient to document the available options for the filter in this project, or provide a link to such documentation for the transpiler.

[izhan]

Updated branch with PR from @yappbox that created a module_id_generator option. Will definitely add documentation and examples -- expect it in the next few days

[hjr3]

:+1:

[izhan]

apologies for the late followup. PR has been updated to include an "available options" link within the readme. I also updated the testing app on the other repo to include an example of setting the moduleName.

Is this PR good to go?