Fix link to Anki website.
Fix inconsistent headline in navigation drawer.
Fix stats not updating when switching between deck and collection.
Merge pull request #514 from agrueneberg/fix-link-to-anki-website

Fix link to Anki website
Merge pull request #516 from agrueneberg/fix-inconsistent-headline-in-navigation-drawer

Fix inconsistent headline in navigation drawer
Bumped version to 2.3beta3
@branch-specific
Merge pull request #515 from agrueneberg/fix-stats-checkandupdate

Fix stats not updating when switching between deck and collection
Bumped version to 2.3beta4
@branch-specific
Other screenshots
Fix NPE in IntentHandler if no action is provided.
Merge pull request #517 from agrueneberg/fix-npe-in-intenthandler

Fix NPE in IntentHandler if no action is provided
Bumped version to 2.3beta5
@branch-specific
added histogram for cards review count and cards relearn count
added ease histogram statistics
reintegrate kanji info
fixed kanji read line null handling