* Decouple from ActionController and ActionMailer
  * Bring back localization support.
  * Prepare to decouple templates from the filesystem.
  * Prepare to decouple localization from ActionView
  * Fix ActionMailer to take advantage of ActionView::Path

Reinstate Base#render_to_string. Introduce AbstractController#render_to_string which stringifies render_to_body.

Rename render_to_string to render_to_body since it may return any Rack-compatible body, not just strings

* 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