Prevent undeletable blocks from being deleted in mutator.

git-svn-id: http://blockly.googlecode.com/svn/trunk@1737 c400ca83-b69d-9dd7-9705-49c6b8615e23
Prevent dragging of inital block in Maze:1.

git-svn-id: http://blockly.googlecode.com/svn/trunk@1738 c400ca83-b69d-9dd7-9705-49c6b8615e23
Add link save button to Block Factory.

git-svn-id: http://blockly.googlecode.com/svn/trunk@1739 c400ca83-b69d-9dd7-9705-49c6b8615e23
Recompile and fix Block Factory bug in r1739.

git-svn-id: http://blockly.googlecode.com/svn/trunk@1740 c400ca83-b69d-9dd7-9705-49c6b8615e23