Promo art stuff for Play Store
Support for "New Posting Engine Test" private board
Update Jsoup library
Support new posting engine, implement quick post

All users now have access to posting without preview, regardless of user
level. This makes step 2 of both the message and topic posting flow
unnecessary and is now removed.
Gradle cleaning
AMP List and Topic Lists support unread post icon

Last post button will change to "First Unread" when appropriate
Cleanup, method consolidation
Cleanup, bug fixes

Should fix bug where going back to a topic caused the format to be
messed up. Also cleaned up autoflag logic
Auto flag fixes
Post errors shouldn't be possible in step 1
Attempt to make post error dialog nicer

Previously it would remove posting interface and the PTR would keep
going
Version 2.4
Play Services 5.2.08 apparently is a no-go for now
Merge remote-tracking branch 'origin/dev'