jquery-ui-rails 5.0: require 'jquery-ui' instead of 'jquery.ui.all'.

When using Rails 4.1(.4), bundle will install jquery-ui-rails 5.0. In this version of jquery-ui-rails, *jquery-ui* must be required instead of *jquery.ui.all*, both in _application.js_ and _application.css_.

Also changing dependency on *jquery-ui-rails* to `>= 5.0` - will this break other stuff (i.e. older supported versions of Rails?).