fixed issue #28

Added comment clarifying what happens when 'unassign' is clicked in
stage edit page. Fixed typos.
Fixed issues 32 and 36

David Daniels & Nikos Phillips
Prop and backdrop scaling has been changed
Remove video avatar code we forgot about
Add 'start' and 'stop' ant target for running UpStage in the background
Fix avatar resizing problem
Merge pull request #38 from dekpient/master

avatar resizing