Made PushShortIns.execute properly handle short integer overflow
Added empty execute method for nop, debug, debugfile and debugline instructions
Merge pull request #8 from izstas/pushshort-overflow

Properly handle short integer overflow in PushShortIns.execute
Merge pull request #9 from izstas/nop-execute

Empty execute method for nop, debug, debugfile and debugline
#738 Frame export fails with EndOfStreamException: Premature end of the stream reached: fixed
Merge origin/master
flash player zoom fix, html5 export fixed when framerate=0
script highlighting fixed
script highlighting fixed 2