add test case for turn gem for testunit.

Putting back mysql2 and sqlite3 in database.yml docs. In case people use 

add tests for ruby-debug gem in Gemfile and make sure that ruby-debug19 is used as long as RUBY_VERSION > '1.9'.

Performance tests improved

The build_association method was added as an API for plugins
to hook into in 1398db01. This commit restores this API and the
ability to override class.new to return a subclass based on
a virtual attribute in the attributes hash.

Using the correct CSS compressor for the yui-compressor gem.

Update Chicago mayor

instruct user to install using Gem file in database.yml template 

3.1: params_wrapper raises error on anynomous controllers

For Issue #1103 - Fix for sqlite3.yml, mysql.yml

Fixed InnerJoinAssociationTest. Need to load essays fixture.

Don't print deprecation warnings every time the user reads or writes an inheritable attribute.  The warnings on declaration is enough.

Optimize parts of HashWithIndifferentAccess

Adding missing require to join_model_test