Removed setters for pick and display_type from question_methods.rb

These duplicate setters already present in surveyor.  Not sure why
these got into the evaluationrx codebase, but they seem to be
messing up the load of kitchen_sink_survey.  Commented them out.
Fixed multiple sliders layering on top of each other on edit question

This problem pops up in several places.  Will fix as going along.

	app/views/surveyforms/_form.html.erb: changed div.Box to div.box

	app/views/surveyforms/_question_fields.html.erb: changed call to
	update_uislider to update_single_uislider.  This keeps slider from
	being called on all existing sliders, and limits it to just the new
	one, if any, that comes with the edited question.

	lib/assets/javascripts/surveyor_gui/surveyor_gui.js: added update
	single slider.

	lib/assets/stylesheets/surveyor_gui.sass: changed div.Box to div.box