isolate the scrolling for chzn-results
Prototype implementation
Merge branch 'isolated-scroll' of github.com:elasticsales/chosen into elasticsales-isolated-scroll

Conflicts:
	chosen/chosen.jquery.js
	chosen/chosen.jquery.min.js
	chosen/chosen.proto.js
	chosen/chosen.proto.min.js
Isolation of scrolling now works in IE.
Clean up mousewheel event handlers to fit existing style

There are differences in the way the Firefox and all other browsers
handle mousewheel events. There are two handlers to take care of this.
Merge branch 'master' into elasticsales-isolated-scroll

Conflicts:
	chosen/chosen.jquery.min.js
	chosen/chosen.proto.min.js
	coffee/chosen.jquery.coffee
Merge pull request #1155 from harvesthq/elasticsales-isolated-scroll

Isolated scroll