Fix the #const_regexp's documentation [ci skip]

Originally introduced in f9086d63, the documentation of this method is
wrong as #const_regexp returns a string to easy the interpolation inside
regular expressions.
Merge pull request #16426 from tgxworld/fix_false_positive

Fixes to TestCaseTest.
Merge pull request #16427 from ryandao/full_stack_source_extract

Full stack source extract
Merge pull request #102 from cristianbica/integration_tests

Integration testing
Add a `required` option to the model generator

Syntax was chosen to follow the passing of multiple options to
decimal/numeric types. Curly braces, and allowing any of `,`, `.`, or
`-` to be used as a separator to avoid the need for shell quoting. (I'm
intending to expand this to all columns, but that's another PR.

The `required` option will cause 2 things to change. `required: true`
will be added to the association. `null: false` will be added to the
column in the migration.
Fixes test for Gemfile entry changes

Broken by fbe38c9e9d4fe9f82518e8ffc1d757459b0c5f1c
Merge pull request #16429 from arunagw/aa-build-fix-gemfile-spring

Fixes test for Gemfile entry changes
add a test for prepending SCRIPT_NAME to generated urls
save a hash allocation per request.
Add config option for cookies digest

You can now configure custom digest for cookies in the same way as `serializer`:

config.action_dispatch.cookies_digest = \SHA256'
Return preconfigured AS::MessageVerifier
Merge pull request #16434 from strzalek/cookies-digest-config-option

Add digest config option for SignedCookiesJar
Revert "Merge pull request #16434 from strzalek/cookies-digest-config-option"

This reverts commit 705977620539e2be6548027042f33175ebdc2505, reversing
changes made to dde91e9bf5ab246f0f684b40288b272f4ba9a699.

IT BROKE THE BUILD!!!
Uppercase HTML in docs.

[skip ci]
Docs: grammar fix for fetch. [ci skip]
Merge pull request #16437 from mscoutermarsh/master

Docs: grammar fix for fetch. [ci skip]
Using delegated connection method
Pass block for logging.

This follows the good practice listed on http://guides.rubyonrails.org/debugging_rails_applications.html#impact-of-logs-on-performance.
[ci skip] Changed options to +options+ for rdoc
Update README.md

Ruby on Rails Tutorial link updated.