Changed api to 9. Android Lint fixes
Added nullable annotations
Fixed exception reporter
Added about dialog and open source licenses
Cleaned up unused layouts and components
Enabled updates ob boot.

Added new permission to manifest. Added BootReceiver to schedule author updates after boot or external sotrage re-mounting. Moved all service update scheduling to an util class. Small clean-ups and lint fixes.
Fixed DirectoryChooserActivity layout
Fixed overlayed category item number. Some cleanups
Added search activity. Debug signing config.
Fixed up nav. Small fixes
Fixed DirectoryCHoose fragment background for pre 11 apis
Draft for SearchLoader and adapter. Moved loaders to a new namespace.
Implemented search loading and sorting.
Fixed layout and trimming search results
Fix for CalledFromWrongThreadException
Improved authors search result ordering
Added cached search results.
Changed GA event categories. Removed redundant string resource.
Art asset changes
Starting changes for 'In Library' indicator