Convert all CP's to ES6 modules.

Tasks:

- [x] Using broccoli-dist-es6-module to build from ES6 source.
- [x] Move each CP to its own file.
- [x] Name files using lowercase and dashes to mimic ember-cli resolver
  conventions.
- [x] Files moved from `/src` to `/packages/es6` to mimic ember's
  structure.
- [ ] ¿Convert to ES6 tests? ¿May I need ember-qunit and test helpers?