Coordinate bug.  Ensure that block is attached to cursor when (quickly) dragged out of a non-closing flyout.

R=spertus@google.com

Review URL: https://codereview.appspot.com/51770043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1607 c400ca83-b69d-9dd7-9705-49c6b8615e23
Update Dart generators to accomodate the last year of changes to both the Dart language spec and to Blockly.

R=digi@google.com

Review URL: https://codereview.appspot.com/51120043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1608 c400ca83-b69d-9dd7-9705-49c6b8615e23
Fix the console error on the Maze readonly iframe.

R=spertus@google.com

Review URL: https://codereview.appspot.com/51790043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1609 c400ca83-b69d-9dd7-9705-49c6b8615e23
Fix scrollbar jumping bug when block is deleted and workspace is dragged.

R=spertus@google.com

Review URL: https://codereview.appspot.com/52530043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1610 c400ca83-b69d-9dd7-9705-49c6b8615e23
Add Dart to the description of the Code app.

R=spertus@google.com

Review URL: https://codereview.appspot.com/52460044

git-svn-id: http://blockly.googlecode.com/svn/trunk@1611 c400ca83-b69d-9dd7-9705-49c6b8615e23