Multiple tag filtering

A simple fix to hide *pill bar* in case of **anonymous user**
This doesn't fix the following urls:
http://neurostars.org/show/messages/
http://neurostars.org/show/myvotes/
http://neurostars.org/show/mybookmarks/
http://neurostars.org/show/myposts/

But the only way to get to those pages now is by typing them