Add unlink-icon CSS.
Add unlink icon to Facebook logo.
Merge branch 'master' into add-unlink-icon-top-right-10
Add a bi-directional binding to user on facebook-form directive.
Change text to "Update" for Facebook linking/unlinking.
Add comment to spin.js
Move userService update to its own function for facebookForm directive.
Implement update behavior for remaining social buttons.
Hide the unlink icon for facebook logo.
Add unlink ability.

* Implement function to save user profile when clicking unlink icon.
* Add listener to watch for changes in profile.*_url.
Style the unlink x icon.
Add ng-show and ng-class behavior to unlink (x) icon.
Change Update button to Link To ... button.
Merge branch 'master' into add-unlink-icon-top-right-10