Add railties to the load path if it's not already there

Reversing the changes related to CommandRecorder

All numerics should be html_safe

Fix has_migrations? check in Rails::Engine

Refactor sprockets asset paths to allow for alternate asset environments

Provide a more explicit message when we try to redirect to a missing location

The changes broke bulk migration tests and were fixed in 4d256bc6;
however that brought back the issue of #1857 and so this commit goes
back to the original scenario and just adds change_table to the list
of methods which are to be recorded in the CommandRecorder. The
method_missing now delegates all calls to the underlying connection as
before.

This fixes the problem of having a non-explicit message when the :location option is not provided in respond_with.

Make to_json take a parameter to exclude root

This reverts commit 987eb7d4.

This reverts commit 7c562d5e.

Conflicts:

	actionpack/lib/action_view/helpers/form_helper.rb

Fixed ActionView::FormOptionsHelper#select with :multiple => false

Remove AssociationReflection#create_association and AssociationReflection#create_association! - they are not called from anywhere.

Assign the association attributes to the associated record before the before_initialize callback of the record runs. Fixes #1842.

Document the change to Array.wrap's behaviour that was made in b4d8c7d1