Added a DEPS file & Makefile rules

You can checkout with the following:

mkdir mydev ; cd mydev
gclient config https://blockly.googlecode.com/svn/trunk --name=blockly
gclient sync
cd blockly
make

This builds the following
  build/Blockly-ADVANCED_OPTIMIZATIONS.js
  build/Blockly-SIMPLE_OPTIMIZATIONS.js
  build/Blockly-WHITESPACE_ONLY.js
  blockly_compressed.js
  blockly_uncompressed.js
  media/blockly.css

Since it builds/outputs files that are under version control, you can commit the latter three files after building.

Review URL: https://codereview.appspot.com/7138067

git-svn-id: http://blockly.googlecode.com/svn/trunk@593 c400ca83-b69d-9dd7-9705-49c6b8615e23
Fixed after goog.dom addition.

git-svn-id: http://blockly.googlecode.com/svn/trunk@594 c400ca83-b69d-9dd7-9705-49c6b8615e23