WIP ES6 lol

needs some work still, like travis and pulling ember and building it and yadayadayada.

available for some early feedback. **tests totally pass so yay!**

todo (i am sleepy so this is nowhere near complete):

- travis
- clean up grunt tasks
- automated test runner for dev
- see if some of the `syncForTest` stuff can be extracted to `Em.Test` cuz man this stuff is a pain in the kiester
- decide whether to use `DS.<Something>` instead of importing the module inside function calls (ping @stefanpenner)
- real AMDizzle build
- CJS build