Restore the ability to use App Engine's cloud storage in non-BlocklyApp pages.  Change the storage-related alerts to dialogs on BlocklyApp pages.  Fix failure to size issue when blocks are loaded.  Fix missing language selector from Plane.  Prevent modal dialog shadow from scrolling with screen.  Minor consistency improvements.

R=spertus@google.com

Review URL: https://codereview.appspot.com/12956043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1220 c400ca83-b69d-9dd7-9705-49c6b8615e23