Add card layout to user view.
Add favicon to the site.
Add "All", "Black", and "White" filtering for Cards#index view using
isotope.
Reorginize JavaScript.

The isotope.js library has been added to vendor/assets/javascripts and
has been included in the manifest after jquerry.  The script file has
been removed fro the cards view and placed into
app/assets/javascripts/isotope-sort.js.  Since it will be used on the
user view page as well as the card view page.