In 0de4a23d the behavior when there is a missing template was changed to
not raise an error, but instead head :no_content.  This is a breaking
change and some gems rely on this happening.

To allow gems and other code to work around this, allow
`default_render` to take a block which, if provided, will
execute the contents of that block instead of doing the `head :no_content`.

updates caching guide to reflect current Rails capabilities [ci skip]

remove `Rails::Rack::Debugger` from guides [ci skip]

Rails::Rack::Debugger was removed in 93559da4

ContentLength is not part of the rack SPEC since rack/rack@86ddc7a6ec68d7b6951c2dbd07947c4254e8bc0d
If you want it, just add it as a middleware in your config.

This reverts commit 0b339787, reversing
changes made to 56d52e37.

As pointed out on the PR, this will hide development mistakes too, which
is not ideal.

Update bundler to v1.10.4

Use single quote in Railties generators Gemfile [ci skip]

Catch InvalidURIError on bad paths on redirect.

Handle URI::InvalidURIError errors on the redirect route method, so it
wont raise a 500 if a bad path is given.

Fix descriptions of databases.rake [ci skip]

revert create and drop task descriptions

Fix the comment about attr_reader of headers [ci skip]

XML documents that are too deep can cause an stack overflow, which in
turn will cause a potential DoS attack.

CVE-2015-3227

Fixes CVE-2015-3226

raise ActiveModel::MissingAttributeError when trying to access a relationship without the foreign key attribute

raise ActiveModel::MissingAttributeError when trying to access a relationship without the foreign key attribute

fixes regression reported on #20253

ActiveRecord::Base#[] was not used cause of 8b954200

Small refactor on db:reset

People should be free to mutate the header object, but not to set a new
header object.  That header object may be specific to the webserver, and
we need to hide it's internals.

this way we don't have to mutate the instance (as much) when writing a
rack response

Deprecate passing hash as first parameter into ActionController::Head

Add missing spec and documentation for button_tag helper

 Added test case for serial? method when sequence name is not quoted

Removed not needed includes, As record_tag_helper is moved to a gem we..

Fix flakyness.

Brought on by my own stupidity :)

db:reset should not prematurely load the environment, so, for instance,
if there is any initializer that touches th DB, it will not touch that
before droping it.

Also this makes the code simpler.

This changed was made back in 15fb4302
, not sure why. But I am pretty much sure we should do it like this, as
drop and setup should load its dependencies tasks if necessary.

[ci skip] Fix the Rails::Generators::NamedBase#template doc

Fix the message verifier encoding issue

make sure to load_config for db:abort_if_pending_migrations