Integration with toranb/ember-template-compiler

I simplified the plugin's code without losing any functionality.

One advantage of this change is that [toranb/ember-template-compiler](https://github.com/toranb/ember-template-compiler) is referencing [handlebars npm package](https://npmjs.org/package/handlebars), so it should be much easier to keep things up to date. Also this [repo](https://github.com/toranb/ember-template-compiler) is using the [ember-template-compiler.js](https://github.com/toranb/ember-template-compiler/blob/master/vendor/ember-template-compiler.js) which is also used by [ember-app-kit](https://github.com/stefanpenner/ember-app-kit) a somewhat official thing.

Also:
- Removed all unnecessary files after changing to toranb/ember-template-compiler
- Fixed tests
- Added travis integration
- Updated package.json dependencies

Is this cool?