Rewrite app to use Angular.js

This has resulted in some bugs which I may need to fix up on.
Fix sorted game order not being preserved
Use some of the angular helper methods to clean up the code
Remove specific concept "finding games" message

The app calls for the games lists asynchronously, so it will always display
the last one in the list; which is pointless.
Fix Giant Bomb footer link being full-width
Adjust responsive styles
Change all external links to open in new tab

In the off-chance that you click on one of the games/concepts but don't want to
lose your search results.
Update bootstrap to 3.0