Initial version of simplified Graph demo.
Completed Graph demo.
Redirect Maze and Turtle to Blockly Games.  Redirect Graph to demos.
Move Plane app to demos.
Merge branch 'master' of https://github.com/google/blockly

Conflicts:
	apps/json/en.json
Add momentary highlighting to Plane's language menu.
Move Code app to demos directory.
Remove core-unsupported languages from Code demo.  Fix resize in Graph.