Returning the module object on init for py3k.

Couldn't import the module under py3k without this happening:

```SystemError: NULL result without error in PyObject_Call```

This makes it importable under py3k. The whole thing seems to work under py3k, I've captured several frames. The python utils need some work, but that's a much smaller job.

Want to send it upstream to deal with https://github.com/gebart/python-v4l2capture/issues/5?

Thanks for your work on py3k support!

![duck](https://cloud.githubusercontent.com/assets/801467/3251649/a3d0dcc8-f1b4-11e3-8d40-a64cc8cb6339.jpg)