Inflector irregular singularize rules
Adding Back Rails::Engine::Railties#engines

Removing it breaks functionality with gems such as Thinking Sphinx.
This restores it with a deprecation warning. Closes #8551
Added test case to prevent regression of chained, preloaded scopes. (#7490)
Test abstract controller's localize method.
Removed ActionController::Base dependency from abstract controller translation tests.
Created state for a transaction and added tests.
Removed reflects_transaction_state.
added db:drop task that executes mysql:drop_databses and postgresql:drop_databases
Added a changelog entry.
Merge pull request #9006 from wangjohn/activerecord_transaction_state

Created state for a transaction and added tests.
Merge pull request #9008 from ranjaykrishna/dbcreate

Added a new rake task in activerecord
Fix markdown formatting to highlight block in changelog [ci skip]
Use 1.9 hash style in docs/comments [ci skip]
Add missing assert calls
Refactor grep call to remove .each

Grep already yields the matching keys to the given block.
Merge pull request #8913 from seejee/regression_test_for_chained_preloaded_scopes

Added test case to prevent regression of chained, preloaded scopes.
Merge pull request #9007 from dpree/master

Enhanced tests for AbstractController::Translation module
In Browser Path Matching with Javascript

When debugging routes ,it can sometimes be difficult to understand exactly how the paths are matched. This PR adds a JS based path matching widget to the `/rails/info/routes` output. You can enter in a path, and it will tell you which of the routes that path matches, while preserving order (top match wins).

The matching widget in action:

![](http://f.cl.ly/items/3A2F0v2m3m1Z1p3P3O3k/path-match.gif)

Prior to this PR the only way to check matching paths is via mental math, or typing in a path in the url bar and seeing where it goes. This feature will be an invaluable debugging tool by dramatically decreasing the time needed to check a path match. 

ATP actionpack
Remove extra sort from test

Cleanup change_schema tests to remove extra sorts on columns.
Fix setting expected value in translation tests

It was being set to nil instead due to the wrong assignment.