Make guide description more concise
Refer to 37signals blog post for alternative

According to the rationale at https://github.com/rails/rails/pull/7833#issuecomment-9141908, we should recommend new users to follow DHH's approach outlined at http://37signals.com/svn/posts/3113-how-key-based-cache-expiration-works.

This is the first step, and perhaps in the future we can write some specific recommendations out.
Updates list of assertions in testing guide
fixes typo in testing guide
corrected a line related to on: :save option in validations
corrected a typo related to on: :save option in validations
Make AM readme example more consistent

At 4a6eba32 mail sending example was rewrited from rails 2 format to
modern rails 3 approach. But passing parameter `recipient` to method
Notifier#welcome was lost.

Passing email as parameter makes this example more solid.
Added instructions of latest bundler install + modified the on: :save option description in validations
Merge branch 'master' of github.com:lifo/docrails
Mention that Dynamic finders have been deprecated in Rails 4
Cosmetic fixes in AM::Base docs. Missed spaces in OpenSSL constants enumerations.

Injected at a1639ad.
Remove superfluous `self.` in Action Mailer mail method documetation

Notation with `self` was sugestted at 0b05acd, when self.defaults was
extlib_inheritable_accessor. But now all Action Mailer examples are
without this self. It's nicer.
Update assets_pipeline with config.assets.precompile location

rake assets:precompile will work if config.assets.precompile is in config/application.rb and not in config/environment/production.rb
Added missing ')' on routing_filter link
Move use of named routes to beggining of the guide
Remove calls to action: and make use of named routes for consistency.
Add changes based on recommendations in Issue #9793