Corrected typo in example on rendering collections in partials changing @posts to @products to match the example

Mention RubyInstaller instead which is actually quite pleasant and runs Rails fine.

Reason: This is an exception. Thing is when you contribute to Rails you need to know how to proceed *now*, the instructions may be different than the ones published with some past release.

This reverts commit d1b239da.

Wanted to revert a different commit with same message

This reverts commit 15d07981.

Reason: This is an exception. Thing is when you contribute to Rails you need to know how to proceed *now*, the instructions may be different than the ones published with some past release.

This reverts commit 3d13dc88.

I maintained on purpose the DeprecatedUrlOptions in ActionMailer and the Deprecated configuration in Railties because they were already addressed by Piotr in his RSoC work.

Adding option to ActiveResource to allow you to not reset the previously stored requests and responses by passing false to respond_to