Convert add answer rows to Ajax

Was adding rows using complex pre-ajax method per Ryan B.'s railscasts.
This method is much simpler

	app/controllers/questions_controller.rb - render_picks_partial does an answers.build if the parameter says
	add row.

	app/views/questions/_answer_fields.html.erb - an unrelated and incidental fix.  Needed to have a hidden field
	for display_order to prevent new rows from showing up in the wrong place.  They were getting tacked to the front
	when they should have appeared at the end.

	app/views/questions/_picks.html.erb - get rid of the link_to.  No longer needed.  Tack an add_answer class onto the
	<p> so we can hook onto it with js.

	lib/assets/javascripts/surveyor_gui/surveyor_gui.js - modify render_picks_partial function to check the add_row parameter.
	If it is there, pass onto the ajax call and questions controller.
fixed format of the dependency editor