Minor changes in preparation for greating turtle tutorial:
- Rename "Draw" category "Turtle".
- Change RGB ranges from 0.0-1.0 to 0-100.
Review URL: https://codereview.appspot.com/7836047

git-svn-id: http://blockly.googlecode.com/svn/trunk@699 c400ca83-b69d-9dd7-9705-49c6b8615e23