Result of building after installing OS X Mavericks.

With the exception of matplotlib, everything is built with stock clang.  I had
to use gcc-4.2 for matplotlib:

    git clone https://github.com/matplotlib/matplotlib.git
    cd matplotlib/
    git checkout v1.1.0
    CC=/usr/local/bin/gcc-4.2 \
    CXX=/usr/local/bin/g++-4.2 \
    PKG_CONFIG_PATH=/usr/local/Cellar/pkg-config/0.28 \
    python setup.py install --prefix=$NUPIC_ENV
Merge pull request #4 from breznak/keep-set-variables

Keep set variables
Built on OS X Mavericks