Using the mysql2 adapter, boolean values were sometimes being incorrectly cast
to 't' or 'f'. This changes the cast to match the mysql adapter behavior, ie 1 and 0.

Added generated unit test for generator generator.

Added generated unit test for generator generator and new test:generators rake task included in test:all rake task.

Do not re-save destroyed association on saving parent object

Closes #11450

Remove deprecated `attribute_missing`.

for attributes that are columns.

No need to add config for x_sendfile_header

As this middleware comes by default in a new
rails app

Added test to check omit for CheckPending when

Active Record is not included.

Rack::Sendfile is loaded by default now

This reverts commit 19ac034b.
And allows webservers to configure X-Sendfile-Type.

Closes #11440 thanks to [@MSch]

Conflicts:
	railties/lib/rails/application.rb

Remove extra decrement of transaction level

Blacklist->whitelist for reference scans in order!

See https://github.com/rails/rails/commit/da9b5d4a8435b744fcf278fffd6d7f1e36d4a4f2#commitcomment-3630064 for discussion.

Stop special-casing Arel::Nodes as exempt from reference scanning in
order. Instead, only scan order values that are strings for a table
reference.

`rollback_active_record_state!` tries to restore model state on `Exception`
by invoking `restore_transaction_record_state` it decrement deep level by `1`.

After restoring it ensure that states to be cleared
and level decremented by invoking `clear_transaction_record_state`,
which cause the bug: because state already reduced in `restore_transaction_record_state`.

Removed double derement of transaction level
and removed duplicated code which clear transaction state for top level.

Fix #11393. Fix default rendered format when calling render method without :content_type option.

Fix default rendered format problem when calling render method without :content_type option. Closes #11393.

railties Rakefile tweaks

Actionview api generation

memorized -> memoized typo fix [ci skip]

Reverts one line from 457b7ff9

CHANGELOG and LICENSE removed as suggested 

Reset @column_defaults when assigning locking_column.

Update YUI Compressor link; tweak UglifyJS

ActionController::Live documentation in the guides.

it's xml, not json

change docs for xml serializer to talk about xml

I'm adding documentation to the action_controller_overview guide which
should tell people how to stream arbitrary data.