Speed up rendering time for creating stacks of blocks.  Eliminate rendering time for deleting stacks of blocks.

R=spertus@google.com

Review URL: https://codereview.appspot.com/12582043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1190 c400ca83-b69d-9dd7-9705-49c6b8615e23
Fix positioning of new blocks. Although r1190 had the side-effect of preventing 'repeat' from jumping in MOOC Turtle, it did not address the underlying issue.  This CL fixes the assumption that newly created blocks will land at 0,0.

R=spertus@google.com

Review URL: https://codereview.appspot.com/12628043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1192 c400ca83-b69d-9dd7-9705-49c6b8615e23
Remove remaining language splash pages.

R=spertus@google.com

Review URL: https://codereview.appspot.com/12613043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1193 c400ca83-b69d-9dd7-9705-49c6b8615e23
Added message documentation for all apps/tutorials.
Replaced some messages in individual apps with shared ones in apps/template.soy.

R=neil.fraser@gmail.com

Review URL: https://codereview.appspot.com/12467045

git-svn-id: http://blockly.googlecode.com/svn/trunk@1195 c400ca83-b69d-9dd7-9705-49c6b8615e23