Updates from Google
Cloned python generator under the name Robokid

No Robokid code incorporated as yet.
Update of xml.js
Incorporate general Blockly updates
Started to define LED and motor blocks
Added comment block and some Blockly updates
General Blockly updates
Update to Blockly r373
Update to Blockly r375
Update to Blockly r376
r377 + motor blocks
Update to Blockly r382
Update to Blockly r385 : unit test code
Update to Blockly r386
Update to Blockly r392
Update to Blockly r397
Update to Blockly 425
Update to Blockly r486
Update to Blockly r490
Update to Blockly r492