Don't support Ember 0.x

 * set bower dependency to ^1.0
 * remove test run against {Ember 0.9.8.1, jQuery 1.7.2, Handlebars 1.0.0-rc.3}
 * remove Ember 0.9.8.1, jQuery 1.7.2, and Handlebars 1.0.0-rc.3 from
   the configuration for `script/fetch_vendor.js`
Always use Ember.Handlebars.get

`Ember.Handlebars.get` is always defined in Ember 1, so there's no need
to fall back on an alternate.
Always use Ember.assert

`Ember.assert` is always defined in Ember 1 and `ember_assert` isn't,
so there's no need to fall back.
Always use the afterRender queue

`Em.run.scheduleOnce('afterRender')` will always work on Ember 1,
so there's no need to fall back on an alternative.
{{t}} helper: use quotes everywhere

In Ember 1, the convention is that a quoted argument is a literal,
and an unquoted one is a binding. {{t}} doesn't currently understand
unquoted arguments as bindings, but the documentation and specs should
at least reflect the convention.
v2.0.0

 * Drop support for Ember 0.x.