Update CHANGELOG.md

update changelog and spec for 7.3.4

update changelog and version for 7.3.3

Update CHANGELOG and version nums for 7.3.2

update CHANGLOG. bump version numbers

bump version numbers

png crush

update spec

Merge branch 'develop' of https://github.com/jessesquires/JSQMessages…

…ViewController into develop

suppress warning for now. fix in next release, see jessesquires#920