Fix broken link in 'Ruby on Rails 3.1 Release Notes' [ci skip]

* Updated syntax

* Updated tests to match syntax

remove needless entry [ci skip]

The option backed to `start` in da269343.

Fixes for the strong & weak ETags guide [ci skip]

remove blank line generated in application_mailer.rb

remove unused `require`

Typo:- Fix length validation error [ci skip]

Clean up after a failure in a run callback

Prevent db:schema:load to protected environments

Simply use `select_value` in `show_variable`

Move quoting methods to `Quoting` module

This reverts commit a3d085a4, reversing
changes made to e2df1c6d.

It broke the build

Add test case for interpolation with passing of data along with record

Update example of passing a proc to `:message` option for validating records [ci skip]

- This change is made as the behavior for `:message` proc was changed in
  https://github.com/rails/rails/pull/24119.
- Also check
  https://github.com/rails/rails/pull/24431#issuecomment-206106790 for
  reference.

Fix Active Model basics introduction to indicate it only introduces us to integration and not complete i18n framework.

Fix Active Model basics introduction [ci skip]

* Fix undefined method `owners' for NullPreloader:Class

Fixing undefined method `owners' for
ActiveRecord::Associations::Preloader::NullPreloader:Class

* Use Ruby 1.9 hash format

Use Ruby 1.9 hash format

#24192

[Rafael Mendonça França + Ladislav Smola]

Sendmail default arguments match Mail::SendMail

Use SQLite3 3.7.15 which supports multiple values insert

Avoid unused capture

Remove hard-coded backticks in SQL statements

The hard-coded back-ticks made it hard to use a different char for quoting db fields. This checkin replaces it with quote_table_name.

Removes `-t`

ActionCable protocol negotiation

In particular, the fact that ApplicationController is the only
one inheriting from AC::API is not a default. You could say at
most that generators generate them that way, but the creation
of controllers is something which is out of our control because
programmers write controllers by hand.

Instead, we can say that normally, conventionally, as in the
majority of Rails apps, that is the actually the case.

This is primarily for backwards compatibility for when
or if the protocol is changed in future versions.

If the server fails to respond with an acceptable
protocol, the client disconnects and disables
the monitor.

Move `quoted_date`, `quote_string` and `quote_table_name_for_assignment` methods to `Quoting` module

Extend `ActionController::TestCase` deprecation warning

Update documentation based on the new changes for strong & weak ETags.

- Update info for weak ETag
- Add info for strong ETag
- Add examples for strong and weak ETags
- Display difference between generated strong and weak ETags strings.