adds notes on documentation
removes export tests
merges todos and start documentation
todo users
TODO cargos
espacios entre todo
fix error pundit
policy galery
external_branch policy
imageSlider policy
postpolicy
fix name var user policy
desc before filter backend
Merge branch 'ft_policies' into dev

Conflicts:
	app/controllers/backend/external_branches_controller.rb
	app/controllers/backend/galeries_controller.rb
	app/controllers/backend/image_sliders_controller.rb
	app/controllers/backend/pages_controller.rb
	app/controllers/backend/users_controller.rb