Simple qiita pet tests

Adds a bunch of simple tests to make sure that pages render. Some pages and functions are not tested because there is no simple way to test them, but this covers almost all of them. 

Already found one issue using the tests and fixed it.
Can you remove this line?  I know it's in a lot of our other `__init__.py` files, but it's unnecessary. The import from `__future__` is also not needed.