Ensure that status codes are logged properly

Needed to move AC::Metal::Instrumentation before AM::Metal::Rescue
so that status codes rendered from rescue_from blocks are logged
properly.

Fix Rails::Generators::Actions#environment when env is passed

ActiveModel support for the :include serialization option

Optimization of ActiveModel's match_attribute_method?

Raise an ArgumentError if user passing less number of argument in the dynamic finder

Checking with to_s. As regexp fail with 1.8.7

Don't do remove_possible_method when delegate is used. Two reasons: 1) warnings should be shown, and fixed at the source and 2) the code is slow. Fixes #1937.

The previous behavior was unintentional, and some people was relying on it. Now the dynamic finder will always expecting the number of arguments to be equal or greater (so you can still pass the options to it.)

So if you were doing this and expecting the second argument to be nil:

    User.find_by_username_and_group("sikachu")

You'll now get `ArgumentError: wrong number of arguments (1 for 2).` You'll then have to do this:

    User.find_by_username_and_group("sikachu", nil)

Fix a wrong assertion on url_helper_test, and add missing `#html_safe?` a

Render partial invalid check

Revert "Fix failure in test_preserves_existing_fixture_data from test/cases/fixtures_test.rb when UTC and local time occur on different dates." I am pretty sure this was an incorrect fix, and it still failed in certain circumstances anyway. I am now unable to reproduce the original failure I was experiencing so will leave it for now and see if this pops up again.

This reverts commit e4479b2f.

This commit moves support for the :include serialization option for
serializing associated objects out of ActiveRecord in into ActiveModel.
The following methods support the :include option:

  * serializable_hash
  * to_json
  * to_xml

Instances must respond to methods named by the values of the :includes
array (or keys of the :includes hash). If an association method returns
an object that is_a?(Enumerable) (which AR has_many associations do), it
is assumed to be a collection association, and its elements must respond
to :serializable_hash. Otherwise it must respond to :serializable_hash
itself.

While here, fix #858, XmlSerializer should not singularize already
singular association names.

One duplicate was eliminated: test_to_xml_including_methods/
test_methods_are_called_on_object.

As we are adding db folder in it. Required in test also.

Better formatting of rake routes (issue #1991)

This route:

    match 'foo/:id' => RackApp, :id => /[A-Z]\d{5}/

is shown as:

    /foo/:id(.:format) RackApp {:id=>/[A-Z]\d{5}/}

Adds gem helper rake tasks to engines generator

Added db to gemspec so migrations are packaged

Fix wildcard route code example in changelog