On the `/search` route, the nottagged parameter doesn't work properly (at least it isn't specially documented to only work at certain times)
For example:
http://api.stackoverflow.com/1.1/search?pagesize=25&body=true&page=1&nottagged=iphone

returns no results unless the `tagged` parameter is set, even if I set the `intitle` parameter without the `tagged` parameter, `nottagged` still doesn't work