* Rename <framework>/rails.rb -> <framework>/railtie.rb
	* Rails::Plugin -> Rails::Railtie
	* Rails::Plugin::Vendored -> Rails::Plugin

This reverts commit 7e8b7f46.

Conflicts:

	railties/lib/rails/plugin.rb

Isolation tests intentionally avoid loading any state (because they're often testing things that have their own load path semantics that should not be polluted), so rack/test is not yet  on the load path. Moving require "rack/test" into the setup means and after boot_rails means that it'll be required after the laod path has been altered to add in the Rails vendor/gems

Make /rails/info/properties work again. Also, the mocked up tests were passing so we added a test that actually tested this functionality.

Isolation tests intentionally avoid loading any state (because they're often testing things that have their own load path semantics that should not be polluted), so rack/test is not yet  on the load path. Moving require "rack/test" into the setup means and after boot_rails means that it'll be required after the laod path has been altered to add in the Rails vendor/gems