fix #49

[dcferreira]

This was removed in a previous commit, but it breaks urls for some reason, as described in #49.
I just restored this line from cdc675b, where it was still working

[dcferreira]

Test still fails, but somehow seems to be in a non-related part of the code? Not sure what to think of this.

Either way I think a check is missing in reverse_url@statik/views.py, about whether the path is a file or a directory. I did a dirty fix in that it just checks for "*.js", and the data-simple example renders correctly. Obviously, all other file extensions are missing.

[thanethomson]

Thanks for the PR! Let's get the tests passing though 😁 I'll investigate too.

[dcferreira]

I'm extra confused here because the following command:
git clone https://github.com/thanethomson/statik.git statik_tmp && cd statik_tmp && python -m unittest discover
fails with the same error that travis throws now (even though the latest commit in master passed the tests, according to travis).