Transitioning documentation to PEP 257 style format

I went ahead and started to transition some of the documentation over to the [PEP 257](http://legacy.python.org/dev/peps/pep-0257/) format, specifically the [NumPy/Scipy style](https://github.com/numpy/numpy/blob/master/doc/HOWTO_DOCUMENT.rst.txt). I also added some installation, licensing, and dependency information to the README. The work is only partially complete because I didn't want to invest too much time if this something that you do not prefer. 

The desired result, at least in my mind, is to have sphinx generating the documentation, especially with [readthedocs](https://readthedocs.org/) integration with the README containing only an introduction and the installation type information.

Best,
-tamas 
I wasn't sure how exactly these weights were used in the model.