Merge pull request #35 from gschorkopf/killpack/friends

Killpack/friends
Add friendable users endpoint

[#22]
Add Friendable User ember model

[#22]
Add a friendable users controller; embed it in the friends route

Also add a little crappy placeholder friendable users template.

[#22]
Add typeahead library

[#22]
Add Autocomplete component + stylin'

[#22]
Add autocomplete field to friendable users page

[#22]
Use the right key event so we capture backspaces

[#22]
Clean up autocomplete component + friendable users controller

- Make it leverage events and properties, rather than a bunch of custom
  functions and stuff
- Fix clearing out the old user if the query has changed
- Disable the + button if there's no user selected

[#22]
Clarify some property names

[#22]
Add an endpoint for creating a new friend

[#22]
Actually call _super() correctly in friends route

I was calling super(), but not passing the arguments, which meant that
the model in the friends route was always null. #whoops

[#22]
Make the + button ask the API to create a new friend

[#22]
Clear out all the data on logout
Now we shouldn't have to worry about spooky crufty data anymore.

[#22]
Center friends

[#22]
Make friendships added by the API mutual

[#22]
Change header on friends page

[#22]