Make drags cancellable by pressing escape
- Sometimes doesn't work?
Rebuild
Trying to fix up merge with master
Experimented with music block colour and some bug fixes.
Fix dragging blocks issue
Hide top nav on embedded instances
Fix loading gist via URL
Merge pull request #371 from dannywils/master

Fix dragging blocks issue
Initial "recent gists" submenu

Not completely functional
Initial skeleton of an undo/redo system
fix for #372
Merge pull request #373 from waterbearlang/372_broken_in_firefox

fix for #372
Add undo and redo to the context menu and make cut/copy/paste undoable/redoable.
Implement undo/redo for dragging, not yet fully functional
Added images for the breakout tutorial
Merge pull request #374 from apepers/master

Added images for the breakout tutorial
Fixed set direction blocks in breakout example
fix merge conflict
Merge branch 'master' into 250_undoredo
Merge branch 'master' into canceldrag

Conflicts:
	dist/arduino.js
	dist/javascript.js
	dist/minecraftjs.js