Increase hotspot area of trashcan.

git-svn-id: http://blockly.googlecode.com/svn/trunk@1671 c400ca83-b69d-9dd7-9705-49c6b8615e23
Add an optional visual list of current document collaborators.

Fixes issue 197.

R=neil.fraser@gmail.com

Review URL: https://codereview.appspot.com/80700047

git-svn-id: http://blockly.googlecode.com/svn/trunk@1672 c400ca83-b69d-9dd7-9705-49c6b8615e23