Rack::Mount was replaced by Journey, Fixed comment

Minor code duplication removed

Make `rake doc:guides` works again.  Fix #10384.

Moved update_record logic to relation.rb

add missing :nodoc: marks to ActiveRecord::Delegation [ci skip]

Fix assets precompiling in production guide

You need to specify `RAILS_ENV=production`

Related to https://github.com/rails/sass-rails/issues/152.

/cc @guilleiguaran

Removing Railtie::Configurable and replacing it with class methods

Railtie itself abstract. This stops the weird behavior of forcing
subclasses of Railtie to include the Configurable module.

StatementInvalid takes WrappedDatabaseException's place

Making the retrieval of the cache store class a method

Fix travis links in readme [ci skip]

Fix typo in serialized_attribute_test. [ci skip]

comments for the expand_cache_key method.

* Highlights the requirement of an attributes method.
* Removes some details that depend on the implementation of the class including the module.
* Applies guidelines here and there.

Module#delegate checks nilness rather that falsehood if :allow_nil is true, and avoids multiple evaluation of the target method

Notes:

1) I hope nilness is a word.

2) See rationale for avoiding multiple evaluation in a comment in the patch, credit goes to @jeremy for pointing out this gotcha in the existing implementation.

3) Embeds a little joke dedicated to @pixeltrix (it could be worse! :D).

References #10347.

links were redirects

Improve poor security recommendation in docs

[ci skip]

Propose better documentation for ActiveSupports `next_week` functionaility

Delegation method bug

Add documentation and test to delegation method that make sure we're
aware that when a delegated object is not nil or false and doesn't
respond to the method it will still raise a NoMethodError exception.