Merge pull request #11 from diox/detail-thumbnails-and-screenshot

Make buttons to switch thumbnails work in detail view (bug 994822)
Add missing view to Gruntfile
Watch CSS files, too.
Add category menu, empty category detail view
Merge pull request #12 from chuckharmston/categories

Add category menu, empty category detail view.
integrate content ratings (bug 995307)
polish content ratings, tile typography
add iarc to locales, more tile typo
Add content_ratings to Gruntfile (bug 995307)
Make sure stars are correctly positionned when there is no content ratings
Don't let click to install button propagate down
Fix content ratings translations errors
Add more missing strings to locales.ini
Move indexing stuff to its own file (bug 995418)
style thumbnail switchers