Add setup.py to allow install using pip

[jhillacre]

adding a setup.py would allow this package to be installed using pip, like so:

    $ pip install git+git://github.com/jotform/jotform-api-python.git

Or:

    $ cat requirements.txt
    django==1.6.5
    jotform>=1.0,<2.0
    stripe>=1.18.0,<1.19.0
    $ pip install -r requirements.txt

Having a setup.py in your package would also be the first step toward getting this package registered on https://pypi.python.org/pypi , allowing your package to be installed as easy as:

    $ pip install jotform