So that we can bundle and travis can run our tests.

This reflects the fact that it now impact inserts as well as updates.

In non-strict mode it is '', but if someone is in strict mode then we
should honour the strict semantics.

Also, this removes the need for a completely horrible hack in dirty.rb.

Closes #7780

This is similar to #first_or_create, but slightly different and a nicer
API. See the CHANGELOG/docs in the commit.

Fixes #7853

Do we actually need this cache?

need to check for the length of @filters

rather than exiting the process.

Extend date_select helper functionality.

Conflicts:
	actionpack/CHANGELOG.md

Setting the action_dispatch.rack_cache options to true or a hash should
be the way to enable it.

Credit for previous commit [ci skip]

active_model/validations requires necessary files to run

attributes