Remove Oracle / Sqlserver / Firebird database tasks were deprecated since 4.0.

Closes #10819

Move the write portion of fragment_for to its own method to allow for easier creation of custom cache methods.

When .find_each is called without a block, return an Enumerator.

Change Result#each to return an Enumerator when called without a block.

Fix typo in docs. HABTM associations should use a pluralized name [ci skip]

Fix undefined method `ref' for nil:NilClass for bad accept headers

Verbose mode on when running tests

Closes #11077 [ci skip]

removed unnecessary mapping for on options

We are now rails 4

Fixed menu section's location (guides)

ActionView flows comment typo

Right before that in `assert_valid_transaction_action` method we make
sure that `options[:on]` contains values from `ACTIONS` array
(`[:create, :destroy, :update]`) and nothing more (i.e. it could not
contain strings or something else, otherwise the error is raised).

Also I've polished some docs.

restore correct scaffold generation

In #11088, `#to_a` was added to remove a deprecation around using
`#all`. I merged, but it really should have been `#scoped` instead, as
that's the preferred replacement.

fix deprecation warning in scaffold controllers

Fixing issue  #11083 

Removing other occurrences of `the` appearing twice

Merge `:action` from routing scope and assign endpoint if both `:controller`
and `:action` are present. The endpoint assignment only occurs if there is
no `:to` present in the options hash so should only affect routes using the
shorthand syntax (i.e. endpoint is inferred from the the path).

Fixes #9856

Flag cookies as secure with ignore case in ActionDispatch::SSL

ActionDispatch:SSL: don't include STS header in non-https responses

[ci skip]

Conflicts:
	actionpack/CHANGELOG.md

Remove `another_contract` as it isn't being used