asset-pipeline: Move load to application.{js,css} and add plugins and themes paths

Conflicts:
	app/helpers/layout_helper.rb
	app/views/layouts/_javascript.html.erb
	config/application.rb
	config/initializers/assets.rb
	plugins/responsive/lib/responsive_plugin.rb
	public/javascripts/application.js
Merge branch 'distribution-rails3' of https://github.com/rede-gcr/noosfero into distribution

Conflicts:
	public/javascripts/application.js