Fix #5847 and #4045. Load AR::Base before loading an application model.

This feature enables the ability to load an
external routes file from the router via:
  draw :filename

External routes files go in +config/routes+. This
feature works in both engines and applications.

Always quote hstore keys and values

Conflicts:
	activerecord/test/cases/associations/belongs_to_associations_test.rb

Don't indent blank lines in named base generators

Refactor Observer.observed_class

Revert "Added warning that require_tree includes files in unspecified order. So, that people may know the order of their scripts might be the reason that their scripts work in just fine in development but not in production. "

This reverts commit 9dbd5111.

Reason: Sounds like something for the guide, not the template.

removing changes made in ccd0b511 and 189a1728 [ci skip]

Remote ip logic and validation. IPv6 support.

Duplicate quote_table_name method

cleanliness in method parameters

Stamp out ruby-debug with debugger everywhere else in the code base

Minor refactor of serializable hash