Start app when menu/dashboard is selected
Implemented web buttons
Added review summary page to back blacklist
Use /review instead of /review/session for review summary page
Disable back button when showing lessons info
When notification is touched, update URL of integrated browser (if open)
Fixed back button on lessons review info
Added estimates
Merged avg and levelup sentences
Remove min and max levelup times from stats
Fixes NPE when pressing Back too early
Release 1.5.2