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.

This reverts commit b4239622, reversing
changes made to f99ce3c1.

Reason: This broke the build
https://travis-ci.org/rails/rails/jobs/6629894

Fix ActionView::Digestor to correctly pass format to LookupContext

Conflicts:
	actionpack/CHANGELOG.md

This commit adds support for passing additional url options along
with a :status option and any of the flash-related options to
`redirect_to` (i.e. :flash, :alert & :notice).

Closes #7570.

ActionView::Digestor now passes arguments correctly to
LookupContext::find method. This makes cache digests
respect the format option correctly.

FixtureFinder in tests also changed to reflect this.

The `force_ssl` command now builds the redirect url from `request.fullpath`.
This ensures that the format is maintained and it doesn't redirect to a route
that has the same parameters but is defined earlier in `routes.rb`. Also any
optional segments are maintained.

Fixes #7528.
Fixes #9061.
Fixes #10305.

Move method used only in the test to the test code itself

refactor number helper

It's simpler to assume that passed env is just a string without any
extensions, especially when DatabaseTasks are intended to be used also
without rails.

Serialized column should not be wrapped twice. Fix #10067.

This is a public class, which could be used directly in order to allow
easier database management. Now it also contains settings, which will be
used by databases.rake.

This will allow to set fixtures path in global config easier, it should
be not needed to use FIXTURES_PATH every time user wants to load
fixtures.

This fixes issue #10066