fixed require_module for Django 1.9

[shelldweller]

Pull request for #63. Tested under Django 1.7 and later. Once merged, could you please upload a new release to PyPI?

[etianen]

Oh, I just merged #62, but only because it was top of my inbox and appears to work.

Is there any compelling reason why the additional changes in this are an improvement? From what I can tell, using mark_safe is a little simpler in this context, since the template tag is so small.

Happy to reopen this and merge if there's a good reason to do so.

[shelldweller]

I didn't see the other request when submitting mine. My patch has an updated test case that verifies actual template rendering, not just output of template tag. Without this change the old unit test gives a false positive when running under Django 1.9. And updated test case requires a change to settings.py to silence deprecation warning.

[etianen]

I've updated the master branch with your tests. A new release will be out momentarily.