Adding sqlserver.yml template to satisfy "-d sqlserver" 

invocations of "rails new".

This reverts commit 0ecd4640.

See issue #7950.

Now mysql gem can be built on ruby 2.0.0-preview1

This reverts commit 8d8fd131.

mysql 2.8.1 gem can be built on ruby 2.0.0-preview1.

I suck at English, please help me reviewing this <3 <3 <3
[ci skip]

Conflicts:
	actionpack/lib/action_dispatch/routing/redirection.rb

This reverts commit d8596c4b.

Reason: too many mistakes [ci skip]

This reverts commit 25648ce3.

This allows easy upgrading from the old signed Cookie Store <= 3.2
or the deprecated one in 4.0 (the ones that doesn't use key derivation)
to the new one that signs using key derivation

Updated dependency on bundler to ~> 1.2.2

Specifically, remove `ActionDispatch::Head` in favor of `Rack::Head`.

Closes #8232 [ci skip]

Use if..else conditions instead of return guards.
Use _ for not used arguments when iterating.
Set the path variable directly instead of using an empty string and <<.

Introduced in 4a4de567.

regarding linking to Kindle

Use div

Introduce `ActionView::Template::Handlers::ERB.escape_whitelist`