Clean start
Update with pPython 2.6.8 headers, base site.py, and updated .gitignore file.

Results from running (from Python 2.6.8 source):

    ./configure --prefix=$HOME/nta/nupic-darwin64 --exec-prefix=$HOME/nupic-darwin64 --enable-shared
    make
    make install
Remove references to PYTHONHOME, prepend (as opposed to replace) *LD_LIBRARY_PATH
pip and setuptools installed
NuPIC dependencies as of b86f78308c764abe3ad39aa261cd3f97cff8045b
Merge branch 'master' into nobinaries