Random typos in apps.  Change relational block to be RTL-compliant.  Remove obsolete Puzzle README.  Copy Prettify to MOOC.

R=philhwagner@gmail.com

Review URL: https://codereview.appspot.com/13234043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1283 c400ca83-b69d-9dd7-9705-49c6b8615e23
Fix coordinates when scrollbars are not at zero.  Solves hotspot and/or layout problems with trashcans, scrollbars, context menus and tooltips.

R=spertus@google.com

Review URL: https://codereview.appspot.com/13266043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1286 c400ca83-b69d-9dd7-9705-49c6b8615e23