Merge pull request #134 from eestrada/master

Fixed unpacking error
added cancel button to unlock dialog
Merge pull request #135 from jmoborn/master

Warning window for unlock
temporary fix for rollback open version
Merge pull request #136 from jmoborn/master

Rollback 'Open Version' feature temporary fix
Removed abc2bjson tool

Also, changed lockedBy function to use only python 'pwd' module, not spawn a subprocess. Should be a bit cheaper.
Merge branch 'master' of git://github.com/byu-animation/byu-animation-tools