make hash required for message data protocols. close #631
expose left and right bar button container views. update docs. close #634
Merge branch 'develop' of https://github.com/jessesquires/JSQMessagesViewController into develop
Update README.md
add an emptyCache property to invalidation context for explicitly clearing the cache via invalidation. close #633
fix semantics regarding avatarPlaceholderImage and avatarHighlightedImage. close #624
v6.1.0
Commit NSCache cell size
FIX layout cell avatar
Add incoming image cell
Add file kind of cell
FIX layout bottom cell label outcoming
FIX layout avatar
FIX layout mediaView
FIX left-right margin
Change clip button
Fetch from original
Merge conflict