Added cut and paste section buttons.

Can also move by dragging and dropping, but this is more consistent.

	app/controllers/surveyforms_controller.rb: added cut and paste section methods. Follows the same approach
	as cut and paste questions.  Note, paste section needs an instance variable for question_no just like
	paste question.

	app/views/surveyforms/_survey_section_fields.html.erb: added button for cut and paste section to the section bar
	and a paste section button at the bottom of the fieldset.  Added nested divs to center horizontally.  Only show
	cut button when there is no previous cut pending.  Only show paste when there has been a cut.

	config/routes.rb: added routes for cut and paste section.

	lib/assets/javascripts/surveyor_gui/surveyor_gui.js: added jquery for cut section and paste section on button clicks.

	lib/assets/stylesheets/surveyor_gui.sass: added formatting to center cut and paste buttons horizontally.