move mailer testing examples into the testing guide.

Closes #9325.

I adjusted the example and the description in the testing guide and
simply linked from the mailer to the testing guide. This way we don't
have to maintain two separate places.

Add support for pg geometric datatypes point and box

Created a layer of abstraction for the valid type checking in schema dumper. Now, connection handles the check for valid types so that each database can handle the changes individually.

Skipping test for OpenSSL::PKCS5 JRuby

Add a method full_messages_for to the Errors class

Introduce test on Error#full_message for attribute with underscores; Fix...

Fixed typo in railties/test

nil is retuned if cookie is tampered with [ci skip]

if the given key is not found then verifier does raise
`ActiveSupport::MessageVerifier::InvalidSignature` exception
but this exception is resuced and finally nil is returned.

Controller name pluralized

* Fix named route collision in mount test fixture
* Update controller named route precedence test

Transparently upgrade signed cookies when setting secret_key_base

Support .js.coffee views by default

v3 of pull request based on additional feedback from @jeremy

Relaxed jbuilder dependency and bumped version number

Newer version contains some generator bugfixes

Introduce UpgradeLegacySignedCookieJar to transparently upgrade existing signed cookies generated by Rails 3 to avoid invalidating them when upgrading to Rails 4

Fix ActiveRecord locking column defaults not getting persisted

Raise an ArgumentError when a clashing named route is defined

ActiveSupport::MessageVerifier: Updated docs due to removal of serializer accessor

Use jquery-rails from github

completes https://github.com/rails/rails/commit/6f3f0f86332004fcee5c2f05d52bbff08c22f980

Fix update_version_rb task

Fix some typos

Ignore pkg folders