string category docs.
refactor avatar factory to remove enums. whoo.
refactor
Merge branch 'master' of https://github.com/jessesquires/MessagesTableViewController
update spec frameworks.
Merge branch 'master' of https://github.com/jessesquires/MessagesTableViewController
investigating issue #75
tweak send button
fix iOS 7 bubble padding
bump version numbers 3.2.0
edit travis. update schemes.