Fix sprockets_better_errors dependency error.

Asset depends on 'jquery-ui/ui-bg_flat_75_ffffff_40x100.png' to generate properly but has not declared the dependency
Please add: `//= depend_on_asset "jquery-ui/ui-bg_flat_75_ffffff_40x100.png"` to '/Users/lu/.rvm/gems/ruby-2.0.0-p353@shiftit_rails3.2.16/gems/jquery-ui-rails-4.1.0/app/assets/stylesheets/jquery.ui.theme.css.erb'