Merge pull request #374 from yurydelendik/jshint-avm1

Fixing jshint basic warnings in AVM1
Make sure graphics._revision gets increased on every draw operation.
Merge pull request #376 from tobeytailor/master

Make sure graphics._revision gets increased on every draw operation.
Merge pull request #377 from yurydelendik/addedToStage

Minimizes amount of addedToStage event objects; notifies all descendants
Updates jsshell version; adds SHELLABC for AVM2 test compilation
Destroying unused timeline objects