Updated delete icon to Material Design

Copied from the official Google Material Design icon repo
Add 'media' config option.  Deprecate 'path' config option.
Sound URLs now relative to page, not media directory.
RTL demo now in Arabic instead of English.
Add starting blocks to JS generator/interpreter demos.
Fix Block Factory when types are saved.
Initial version of simplified Graph demo.
Completed Graph demo.
Redirect Maze and Turtle to Blockly Games.  Redirect Graph to demos.
Localisation updates from https://translatewiki.net.
Remove references to no longer existing code.google.com
Remove double spaces
Recompile after TranslateWiki push.
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.
Fix redirect on Code demo.
Fix illegal connections in stacks after a healing delete (issue 15).