Replaced our LruCache Image cache for Picasso. Thanks @JakeWharton
Implemented disk caching for remote URLs.
The HttpResponse cache is shared, I know our images are not changing and
we need to save on bandwidth as much as possible. The disk cache is a
modified version of the old DiskLruImageCache, this one is general
purpose, stores byte[]'s. (Updated disklrucache from 1.3.1 to 2.0.1
which should also get rid of some errors)