Fixed allowing terminal block insertions at the top of substacks
Merge pull request #244 from nathan/fix-terminal-insertions

Fixed allowing terminal block insertions at the top of substacks
Added null check in case the user denied access to the microphone.
Prevent handing NaN to the BitmapData constructor
Now supporting retina displays
Error reports show that sometimes proto is not the child of stagePane
Added "record..." to sound menu
Fixed

I broke this before I committed it.
Merge pull request #250 from djdolphin/record-sound

Added "record..." to sound menu... Thanks @djdolphin!
Fixed costume center button being too far to the right