Fix edit user page to work with ZURB 4

-- Use new tab section code
-- Remove dropdown button (due to complexity with hidden file input element)
-- Add responds_to to registrations controller
-- Remove html_shiv from rubycloud because it is included in ZURB foundation
-- Add modernizr to html head
-- Add before_page and after_page content hooks
-- Remove monolithic foundation javascript include and instead include
   them individually so users can remove unnecessary scripts
-- Add foundation init to onready