Add column for fb_access_token to users table in database migration.
Adds first draft of a Facebook library for the server-side interactions we need for the backpack.
Updates library to dynamically generate share urls, fixes whitespacing, and removes debugging console logging.
Adjust header to work with backpack logo
Adding nav with icons and colored hover
Hook up nav to badges and collections routes
Rename hexlogo LESS file to logo
Fixing Open Sans webfonts and consolidating font definitions into one less file
Using logo image because of unavailability of MetaPro font in webfont formats
Move navbar bottom border definition into overrides
Change LESS so that logo height + padding determines navbar height, and other nav items sit on bottom border from that
Override .active styles to add caret below
Add nav active class
Added a summarizeForUser() method to the backpack connect model.

This allows us to easily get the union of all permissions for all tokens
issued to a user, grouped by origin, which will be useful for the
settings page, where a user can see what permissions each origin has, and
optionally revoke them.
added methods to backpack connect model, controller for revoking tokens.
First attempt at a working settings view for revoking issuer connections.
removed extraneous logging call
Added destroy() class method to mysql-base model.

This method is tested by the test for backpack-connect.revokeOriginForUser().
Made a new view/permissions.html partial. bp connect, settings now use it.
Use box-sizing mixin, and reword an irrelevant comment