integrated AnkiStats project in AnkiDroid, updated libAnki Stats class with new functions
Manifest with new Activity entry for new statistics
removed bitmap processing and switched to new custom view for statistics,
combined all 8 statistics chartbuilder classes in one and removed redundancy
reverted to normal CustomExceptionHandler
fixed Answer Buttons statistics for deck life and non whole collections setting,
fixed statistics for decks with no activity in selected time frame freezing app due to infinite loops on ui thread caused by x- or y-start and -end values beeing the same
Issue 2169:	Congratulations message not shown/hidden when filtered deck rebuilt/emptied
Configure Travis CI branches.

This commit updates the configuration for Travis CI to build the release
branches, as well as the 'develop' branch. This should make it so that pull
requests on those branches automatically get a notification about whether the
code builds correctly.
added licence header to new files, adjusted drawing of bar graph to prevent washed out effect from anti-aliasing
Merge pull request #421 from flerda/release-2.2

Configure Travis CI branches.
Merged '45beecc' from develop: Configure Travis CI branches. This commit updates the configuration for Travis CI to build the release branches, as well as the 'develop' branch. This should make it so that pull requests on those branches automatically get a notification about whether the code builds correctly.
Merge pull request #420 from timrae/issue2169

Issue 2169:	Congratulations message not shown/hidden when filtered deck ...
Merged 'd33fd55' from develop: Issue 2169: Congratulations message not shown/hidden when filtered deck rebuilt/emptied
reverted to int for type to follow libanki guidlines
Merge pull request #422 from trashcutter/new_stats

New statistics to include all graphs from Anki-Desktop
Updated localizations
Bumped version to 2.2beta20
@branch-specific
Merged 'b67bf2d' from develop: Updated localizations
Skipped 'eb643c2' from develop: Bumped version to 2.2beta20 @branch-specific
fix: added new navigation drawer layout to deck_picker.xml in layout-xlarge
added navigation drawer to AnkiStatsActivity and updated layout,
updated NavigationDrawerActivity so that Statistics cannot be opend more than once when already open