Make sure we don't redefine an already-defined attribute method.

This means that attribute methods which don't exist will get generated
when define_attribute_methods is called, so we don't have to use hacks
like `attribute_method_suffix ''`.

Remove odd asignation

fix https://github.com/rails/rails/issues/2582 (with testcase)

ActiveResource shouldn't rely on the presence of Content-Length 

Just provide the executable for railtie. This should be fine since Rubygems now warns before overriding them.

Added getting_started application to railties/guides/code/getting_started

db:migrate:status not looking at all migration paths

typo in asset pipeline guide

Use ensure instead of rescue

Code and CHANGELOGS can't be edited in docrails.
You'll need to make this change in rails/rails.

This reverts commit 465752ba.

Use log.warn instead of debug for CSRF token warning

Added a case to check the status of the migration after a rollback and redo.

No need to use </form> here. It's already in whole_form block

Tests for rake db:migrate:status.

Fixed assets precompile regex

Not used variables removed. Warnings removed.