Enable usage of ic-modal with Ember 1.9.0.

See http://emberjs.com/blog/2014/10/16/handlebars-update.html for details, but Ember 1.9.0 will require the usage of Handlebars 2.0. This PR depends on https://github.com/toranb/broccoli-ember-hbs-template-compiler/pull/6 and bumps the major version (as precompiled templates are not compatible between Handlebars 1.x and 2.0).

In the interim users can specify my branch for usage with Ember 1.9.0 by entering the following in their `bower.json`:

```
 "ic-modal": "rwjblue/ic-modal#ember-1-9-compat"
```