Updated Enyo/Backbone lab to not remove the Learn sidebar.

Made several small changes to ensure this demo does not destroy the Learn sidebar.

1. Added framework data attribute to the html tag - it was missing and preventing data from being pulled in to render the side bar.

2. Added an additional wrapper div - enyo wipes out everything it is rendered into.

3. Updated start.js to render into the newly made container instead of the body tag.