Change doc_widget.js to:
- render "edit in jsfiddle" button next to all examples
- make opt out certain examples by adding jsfiddle="false" attribute to
doc:source element
it turns out that even with our tricks, jqLite#show is not usable in
practice and definitely not on par with jQuery. so rather than
introducing half-baked apis which introduce issues, I'm removing them.
I also removed show/hide uses from docs, since they are not needed.
Breaks jqLite.hide/jqLite.show which are no longer available.
