Ability to copy blocks by dragging with alt or cntrl key
- Still a bit buggy!
Fix up copy-dragging; it seems to work quite well now for blocks
Fix issue with copy-dragging expression blocks
Rebuild
Add support for polygon sprites

Rotation, collision, and bounding box are done. Scaling needs to be done
later.
Merge pull request #322 from CelticMinstrel/betterdrag

Copy blocks by holding alt or control key when you drop them
Testing an added set volume block
Add pong demo
Merge pull request #327 from pikalex88/318_music_blocks

Added a set volume block
issue #328, fixed save/load of local names
Merge pull request #329 from dannywils/master

Add support for polygon sprites
fix for missing sibling element
resolved merge conflict by rebuilding
fix for #352
Merge pull request #353 from waterbearlang/352_autofocus_canvas

fix for #352
fix merge conflict
quiet spurious missing file warnings from build script
fix pong example corrupted in earlier merge
add support for running examples
Merge pull request #354 from waterbearlang/support_running_examples

add support for running examples