Updated common.js to accomodate required blocks with XML parameters and adding XML generator for required blocks.
Added XML parameters to maze.js.
Removing text errors from template.soy.
Merge remote-tracking branch 'codedotorg/mooc' into mooc
Missing blocks iframe now resizes to fit the blocks and you can define how many blocks are on a row.
Clean up code before pull.
Changing CHECK_FOR_EMPTY_BLOCKS back to undefined.
jslint fixes
Merge pull request #19 from brokenairplane/mooc

Generated blocks instead of text error messages.