integrated AnkiStats project in AnkiDroid, updated libAnki Stats class with new functions
Manifest with new Activity entry for new statistics
Clean up navigation drawer inheritance
removed bitmap processing and switched to new custom view for statistics,
combined all 8 statistics chartbuilder classes in one and removed redundancy
Merge pull request #415 from timrae/navigationDrawerInheritance

Clean up navigation drawer inheritance
Bumped version to 2.2beta17
@branch-specific
Fixed typo in version string
Bumped version to 2.3alpha2
@branch-specific
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
remove spurious call to onCreate()
Merge pull request #416 from timrae/issue2166

remove spurious call to onCreate()
Updated translations
Bumped version to 2.2beta18
@branch-specific
Issue 2167: Don't add tag unless add tag button pressed
Merge pull request #417 from timrae/issue2167

Issue 2167: Don't add tag unless add tag button pressed
Show some feedback when new tag has been added
Merge pull request #418 from timrae/issue2167

Show some feedback when new tag has been added
Remove landscape layout for 7" tablets
Merge pull request #419 from timrae/issue2161

Remove landscape layout for 7" tablets