Bird is now target-seeking.  Remove unused help messages.

Review URL: https://codereview.appspot.com/13333043

git-svn-id: http://blockly.googlecode.com/svn/@1288 c400ca83-b69d-9dd7-9705-49c6b8615e23
Removing old Bird.

git-svn-id: http://blockly.googlecode.com/svn/@1289 c400ca83-b69d-9dd7-9705-49c6b8615e23
Adding new Bird.

git-svn-id: http://blockly.googlecode.com/svn/@1290 c400ca83-b69d-9dd7-9705-49c6b8615e23
Merge remote-tracking branch 'remotes/svn'. Adds Bird.
Edited wiki page Credits through web user interface.

git-svn-id: http://blockly.googlecode.com/svn/@1291 c400ca83-b69d-9dd7-9705-49c6b8615e23
Converted feedback to modal dialogs.
Added final hints for Turtle 3.
Updated i18n instructions.
Added colour to final Turtle level.
Added alert if user tries doing Turtle 3, Level 8 or 9, without having done previous level.

R=neil.fraser@gmail.com

Review URL: https://codereview.appspot.com/13304043

git-svn-id: http://blockly.googlecode.com/svn/@1292 c400ca83-b69d-9dd7-9705-49c6b8615e23
Change scrollbars to bind to workspaces instead of random DOM elements.  Move get/setMetrics from scrollbars to workspaces.  No functional changes.  Also fixes invisible horizontal scrollbar issue reported by Spencer Gordon.

R=spertus@google.com

Review URL: https://codereview.appspot.com/13315043

git-svn-id: http://blockly.googlecode.com/svn/@1293 c400ca83-b69d-9dd7-9705-49c6b8615e23
merged svn