Packaging

I think that zeronet can be packaged via setuptools and uploaded to PyPI instead of using custom update scripts. You will only need to create setup.py file.

Pros:
- Official way to install python packages
- Easier to install (pip install zeronet, dependencies are downloaded automagically)
- Easier to update (pip install --upgrade zeronet)
- [Command line scripts](https://python-packaging.readthedocs.org/en/latest/command-line-scripts.html)

Cons:
- Some modifications to source code (mostly imports) may be required

If you think that such modifications can be useful, i can work on this issue and create PR later.