Added tag_cloud test

Strange! Seems like tag cloud *does* count hidden posts
I've "bent" the test to pass, but wonder WTF
Don't filter out hidden posts in tag count

https://github.com/kylewm/redwind/pull/17#issuecomment-65340737
"Burry the evidence"

The mystery in the tests is no longer relevant,
(although still a mystery).
Merge branch 'tagcloud' into deployment