Replace alert modal with something less obtrusive

Using an alert box is not the best UI.
See a good alternative here:
http://www.commandlinefu.com/commands/browse

![screenshot 2014-08-04 11 53 48](https://cloud.githubusercontent.com/assets/30460/3798689/30c7331e-1be7-11e4-80d6-204300beca6b.png)

Fades in and out