Ensure version specific trees are processed properly.
Ensure version specific trees are processed properly.

Prior to these changes, the version specific trees were not being processed properly by liquid-fire's `ember-cli-babel` version and were instead falling back to utilizing the global ember-cli ES6 transpilation (as a second phase after the addon itself is finished).

Future versions of ember-cli will remove that second phase of transpilation (and speed up app builds fairly dramatically by avoiding parsing and transpiling things twice). This also simplifies the bizarre internal knowledge required (why the heck are we using `modules/` as a path?!?!?!).

ef4/liquid-fire,ember-animation/liquid-fire,ember-animation/liquid-fire,jrjohnson/liquid-fire,ef4/liquid-fire,jrjohnson/liquid-fire