Fix typo in Rails 4.2 release notes
Merge pull request #17794 from zavan/fix-typo

Fix typo in Rails 4.2 release notes
Fix format "Form Helpers" guide

The `"_tag"` was interpreted as the start of a italics.
Merge pull request #17796 from leafac/fix-format

Fix format "Form Helpers" guide
edits in the release notes for 4.2
removes double mention of deliver_now
rails -> bin/rails in index.html
updates some pointers in the guides welcome section [ci skip]
StatementCache is private API

It should not be used in applications
Action Mailer change log pass

[skip ci]
Update the StatementCache documentation
Merge pull request #17800 from jonatack/patch-8

Action Mailer change log pass [ci skip]
Fix CHANGELOG typo introduced in e2cce6cd [ci skip]
Follow-up to e2cce6c

[skip ci]
Merge pull request #17801 from jonatack/patch-8

Clarification follow-up to e2cce6c [ci skip]
[ci skip] Remove outdate note of :dependent
Merge pull request #17802 from aar0nTw/remove-dependent-with-through-note

[ci skip] Remove outdate note of :dependent in guide
Merge pull request #17803 from sadfuzzy/patch-2

Update cookies.rb
Conflicts:
	actionpack/lib/action_dispatch/middleware/cookies.rb
Revert "Test against rack master"

This reverts commit 2a4e14db981e38611667d407a975600ee720ada7.
Bump to rack 1.6.0.beta2