Styling for bundle details charm info
This branch styles the charm details panel that appears on the bundle details tab.
To test browse to http://localhost:8888/sidebar/search/bundle/~benji/wiki/5/wiki/:flags:/charmworldv3/?text=wiki and click the visible charm icon.
The panel shows a square before the icon has been clicked. This is because the panel showing/hiding has not been implemented yet. This is also why the close icon currently does nothing.
R=gary.poster
CC=
https://codereview.appspot.com/14483046