v2.0

@ebryn @rlivsey @hjdivad

This is the smallest thing that could be considered v2.0: drop support for Ember 0.9.x.

 * drop support for Ember 0.9.x in `bower.json`
 * always use `Ember.Handlebars.get`
 * always use `Ember.assert`
 * always use `Ember.run.scheduleOnce('afterRender')`
 * add quotes for all keys passed to `{{t}}` (even though unquoted arguments aren't yet treated as bindings)

I think the things discussed in #38 can be done in various v2.x releases or in v3.0. This helps us not waste time on supporting outdated Ember.