Merge pull request #1427 from tobytailor/nat

Text related fixes
Enable execution of AS2 action blocks in nested MovieClips
Merge pull request #1428 from tschneidereit/nat

Enable execution of AS2 action blocks in nested MovieClips
Merge pull request #1429 from tobytailor/nat

Fixes wrong text positioning
Merge branch 'nat' of github.com:mozilla/shumway into nat