* Required small architecture change

* Created several macros for writing simpler specs
* Finished making Rack::Test work right
* Implemented render_to_string
* Status Codes
* render :text => nil

Conflicts:

	actionpack/lib/action_controller/base.rb
	actionpack/lib/action_dispatch/http/mime_type.rb
	actionpack/lib/action_dispatch/http/request.rb
	actionpack/lib/action_view/base.rb
	actionpack/lib/action_view/paths.rb
	actionpack/test/controller/session/cookie_store_test.rb
	actionpack/test/dispatch/rack_test.rb
	actionpack/test/dispatch/request_test.rb

[#1816 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

Controller, response, and request should all refer to same session, even after a call to session_reset [#1823 state:resolved]
Signed-off-by: NJoshua Peek <josh@joshpeek.com>