Merge pull request #404 from tobeytailor/display

Patch BitmapData.
Add IR.Copy node.
Adjust performance test thresholds.
Fixes getting children() of children()
Merge pull request #407 from yurydelendik/vimeo-config

Fixes getting children() of children()
Fix stub entry.
Merge pull request #403 from mbebenita/runtime

Runtime Refactoring
Skip invisible display objects in BitmapData::draw.
Handle single character button states.
Fix png construction.