Implement notifications in the UI

Implement notifications in the UI per design:

![screen shot 2014-12-01 at 15 38 40](https://cloud.githubusercontent.com/assets/218391/5248121/3c0597c0-7970-11e4-85b3-8c614e5f3554.png)

In the first iteration, the notifications shouldn't necessarily be hooked up but have all util functions ready to use.

- Bootstrap's alert component should be used. https://github.com/goodybag/bootstrap-notify wraps this nicely and is easy to use as a notification plugin.
- in gh.api.util a notification utility should be added so that we can trigger an alert with `gh.api.utilAPI.notification([title], message, [type], [id])`
This empty line can probably go