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.
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
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
Merge pull request #423 from trashcutter/stats_navigation_drawer

Added Navigation drawer to AnkiStatsActivity and fixed deck_picker.xml for large devices
optimized use of space on graph frame, decreased left and right frame size , rotated all numbers by 90°, made tick distance dependant on device
optimized CreateChartTask to guarantee serial execution, made CreateChartTask cancelable, optimized text size, fixed legend not showing on Android 2.1 devices
Merged '73b3433' from develop: fix issue 2164 and issue 2182
Merged '362f3a3' from develop: Issue 2166
Merged '9fd83bf' from develop: Updated translations
Skipped '3370af8' from develop: Bumped version to 2.2beta21 @branch-specific
Merged 'b418d0a' from develop: Fix errors in 9aa5d9f
Skipped 'c00a6a3' from develop: Bumped version to 2.2beta22 @branch-specific
Merged '0a9494d' from develop: Fix showing of welcome screen on first app startup. Remove redundant code
Skipped '65a2ab8' from develop: Bumped version to 2.2beta23 @branch-specific
Fix the directory check for collection to make sure they specified a valid directory instead of a path to a file