[WIP] Added setup.py.  

`python setup.py install` now calls cmake, and make and installs python package csympy.  It works but it's missing some info and may need some better error handling/checking.  Addresses half of #160
Btw, I think you have to write it differently. I would remove all your changes, and then just add `PYTHON_INSTALL="yes"` to the Python builds. E.g. the Python 3.3. build becomes:
```
 - python: 3.3
env:
- WITH_PYTHON="yes" PYTHON_INSTALL="yes"
```