Add touch events to all dialogs.  Factor out code dialog into common.

R=spertus@google.com

Review URL: https://codereview.appspot.com/12849045

git-svn-id: http://blockly.googlecode.com/svn/trunk@1238 c400ca83-b69d-9dd7-9705-49c6b8615e23
Add slight LTR (or RTL) bias in ordering blocks for nominally top-down execution.  Fix position of RTL toolbox.

R=spertus@google.com

Review URL: https://codereview.appspot.com/12899046

git-svn-id: http://blockly.googlecode.com/svn/trunk@1239 c400ca83-b69d-9dd7-9705-49c6b8615e23