Remove duplicated to_s method call.

Fix test cases for inflector.rb

simple solution that brings rake stats task to all rails project

remove unused variable warning.

`warning: assigned but unused variable - album`

Remove unnecessary flatten! method call.

`yield` was missing in #with_dup, due to which 57 assertions were not running
in real, and all tests were passing by default.
Error was introduced in commit - 31ceb5e6.

[ci skip] Update GFM link in guides guidelines.

Also remove a duplicated sentence.

Convert source to string if it is present.

The correct status to test should be :switching_protocols.

Remove unnecessary require of Minitest.

Minitest has already been required when calling Minitest.autorun.

Unwrap Constraints objects.  I don't actually think it's possible
to pass a Constraints object to this constructor, but there were
multiple places that kept testing children of this object.  I
*think* they were just being defensive, but I have no idea.

Update all Rails 4.1.0 references in guides to 4.1.1 [ci skip]

I don't know when this changed, checked back up to 3.2 and integration
tests instantiate fixtures just fine.

Improve readability of Explain Queries table in guides

rake stats for engines

documentation link fix and removing unused reader

fixed capitalization [ci skip]

avoid using alias in generators

[Guides] Add documentation for using Rails with a reverse proxy [ci skip]

Fixes URL generation with trailing_slash: true

Conflicts:
	actionpack/lib/action_dispatch/http/url.rb

This mirrors the layout of abstract adapter and puts the definitions
inside the `PostgreSQL` namespace (no longer under the adapter namespace).

/cc @kares