Revert "Allow testing of AR 3.0.0 since this patch level supports all Rails 3.x versions"

This reverts commit ee967855a11ec732f1cb4c7dc0049bf95a8d124b.
Correction, this patch level release will only support Rails 3.2.x
Markdown syntax
Rails 3.2 still supported Ruby 1.8, so we should do our best.