Pypi setup files

Hey Richard @cimatosa,

I added setup files and fixed a small bug (`simple_example.py` did not work). I also updated the readme with a quick guide. If you want to upload a first version of jobmanager to pypi, run this:

    python setup.py sdist upload


Main changes:
- structure of repository (separate directory for jobmanager, examples, doc)
- separate file for version (jm_version.py)
- cool import statements in __init__.py
- __all__ directive in jobmanager.py
- setup files (including install requirements `numpy` and `sqlitedict`


Cheers,
Paul