Search engines still link to old doc versions

Ticket #61 seems to claim that a solution would fix the problem where search engines give results that link to old versions of documentation. Though a fix was implemented 5 months ago, the problem is still occurring. As of today, the first link on both [Google](https://www.google.com/#q=control.monad.reader) and [Bing](http://www.bing.com/search?q=control.monad.reader) link to `mtl-1.1.0.2`, which is _very_ old. The problem is similar when searching for `control.monad.state`, except that the latest version doesn't even appear on the first page of Google results. It is annoying even when I remember to check the version before reading the docs, and extremely confusing when I forget to check. Can something more be done to solve this issue?