Modified sass formatting

	surveyor-gui.sass: fixed formatting for radio and checkboxes affected
	by upgrade of simple_form
Added ability to sort questions

	add_dummy_blob_to_questions.rb: was missing the dummy blob field
	which was preventing Question from saving. Dummy_blob is used
	by carrierwave when simulating a document upload question during
	survey creation.  Document/blob upload is an extension to Surveyor
	added by Surveyor-gui.

	jquery.sortable.ui.js - added the sortable widget from the jQuery
	library.  This allows drag and drop reordering of objects in the
	dom.

	application.js: added require for the jquery.sortable.ui.js.

	_form.html.erb: moved some javascript for sorting questions and
	sections out of the form and into unobtrusive javascript located
	in surveyor-gui.js.

	routes.rb: added a better match for the ajax call to the question
	controller for sorting questions.

	questions_controller.rb: modified for sorting questions.