Addresses https://github.com/rails/rails/commit/ed56e596a0467390011bc9d56d462539776adac1#commitcomment-9145960

addresses https://github.com/rails/rails/commit/91949e48cf41af9f3e4ffba3e5eecf9b0a08bfc3#commitcomment-9144563

This adresses https://github.com/rails/rails/commit/1b7aa62b184c4410c99208f71b59bbac5c5f03be#commitcomment-9147803

Include newer `find_by` syntax example in 4.2 release notes for Adequate Record

Document all options for protect_from_forgery.

[ci skip]

simplify ActiveSupport.test_order definition

It was not done to be included

Use directly TZInfo::Timezone without proxy

This was used by the respond_to/respond_with implementation on this
file, which is now extracted to the responders gem.

This functionality has been extracted to the responders gem.

bebugger doesn't work with Ruby 2.2 so we don't need to support it
anymore

Now that we only support Ruby 2.2+ we don't need this conditional
anymore

Now that Rails requires Ruby >= 2.0 there is need to skip the
`test_depend_on_path` test.

The hack so skip a Thread test for Ruby 1.9 can be removed now that
Rails requires Ruby >= 2.0.

Conflicts:
	activerecord/test/cases/transactions_test.rb

A special `if` statement to support `Psych` for Ruby < 2.0 can be
dropped now that Rails requires Ruby >= 2.0.

Now that Rails requires Ruby >= 2.0, there is no need to check whether
`BigDecimal` exists or not.

Conflicts:
	activerecord/lib/active_record/attribute_methods/read.rb

Add has_secure_token to Active Record

Since real timezone is loaded anyway in `#utc_offset`
which is called during `#create`

Update SecureToken Docs

Add Changelog entry for has_secure_token [ci skip]

Remove unneeded `require 'as/deprecation'`

Tests should still pass after removing `require 'active_support/deprecation'`
from these files since the related deprecations have been removed.

Add missing information regarding callbacks