Allow blocks to be editable in flyout.  Has bugs in RTL.

R=spertus@google.com

Review URL: https://codereview.appspot.com/12787051

git-svn-id: http://blockly.googlecode.com/svn/trunk@1263 c400ca83-b69d-9dd7-9705-49c6b8615e23
Reverse the direction of the slider getValue, to match setValue.  Make puzzle app blocks undeletable again.

R=spertus@google.com

Review URL: https://codereview.appspot.com/13167044

git-svn-id: http://blockly.googlecode.com/svn/trunk@1264 c400ca83-b69d-9dd7-9705-49c6b8615e23
Add dead-end to Maze for left-hand wall followers.

Review URL: https://codereview.appspot.com/13024050

git-svn-id: http://blockly.googlecode.com/svn/trunk@1266 c400ca83-b69d-9dd7-9705-49c6b8615e23
Bump blocks back onscreen if they stray off the edges.

R=spertus@google.com

Review URL: https://codereview.appspot.com/12856046

git-svn-id: http://blockly.googlecode.com/svn/trunk@1267 c400ca83-b69d-9dd7-9705-49c6b8615e23