There's no reason for guides to reference old behaviors. They should
be current as of the versions of Rails that they ship with, and including
older information just clutters thing.

I discussed this change with @fxn and he agrees.

We have three or four different introduction sentences to the guides.
After this commit, we use the same one everywhere.

Talked with @fxn about this. Bullet points should have periods at the ends.

This reverts commit 223ed2b4.

Reverting since rake routes right align named route. See some discussion in
https://github.com/lifo/docrails/commit/223ed2b4832d63853b61ccb8e9ff82fcd835e61f#commitcomment-2104595

This reverts commit f5b9ed4f.

REASON: Translation work can not be done in the docrails repository

In Textile `*` would convert to `<strong>`, but in Markdown we have to
use `**` instead.

This reverts commit 6acebb38.

Usage of this feature did not reveal any improvement in existing apps.

Conflicts:

	actionpack/lib/action_dispatch/routing/mapper.rb
	guides/source/routing.textile
	railties/lib/rails/engine.rb
	railties/lib/rails/paths.rb
	railties/test/paths_test.rb