Installer/setup script

Hi Miquel,

I just added a setup script (using distutils module) in order to ease the distribution/installation process of python modules (no more path hacks, manually copy files and so on)... details [here](http://docs.python.org/2/distutils/index.html#distutils-index).

You can do the following:

    # 'Hack' the pythonpath using the dev staging area via an egg-link file
    python setup.py develop

    # Install python modules copying them to lib/site-packages
    python setup.py install

    # Create a binary windows installer
    python setup.py bdist_wininst

    # A lot more... including upload to the python package index
    python setup.py --help-commands

Are you interested?
I see a lot of people asking about the installation process and I thought this could be a nice addition to the project, I think it's important let people worry about rigging stuff instead of python specifics.

What do you think? Worth it?

By the way, I was tempted to write this in spanish but you know, maybe someone else want to say something about the 'installer' thing. :)

Cheers!