Add docs for redirect_to
Add docs for render_template
Add docs for render_with_layout
Add docs for rescue_from
Add docs for respond_with
Add docs for route
Add docs for set_session
Add docs for set_the_flash
Flesh out ActionController module
Revert "Flesh out ActionController module"

This reverts commit b137111924fe4283915790f27e4355009d1d38c5.
Remove module docs for ActionController, ActiveModel, ActiveRecord
Privatize things that we don't want in the docs