replace pure whitespace or "null" with Nan
Don't assume virtualenv, remove cruft associated with it
UNTESTED: first attempt at setup.py
install ccache for fast re-builds
BUGFIX: add missing comma
BUGFIX: s/boost/boost_random/
BUGFIX: add missing source file State.cpp
pick up all packages with packages argument to setup; move cython code to path crosscat.cython_code.X
add back install_hcluster.sh with modifications
apt-get update, else get failure
add 'set -e'
install hcluster with special script
modify cwd so setup.py can be run from anywhere
add --exists-action to work around possible issue

packer log file said /tmp/CachedPythonPackages/hcluster-0.2.0.tar.gz exists
only 'pip install --download' if file doesn't exist
BUGFIX: include crosscat.cython_code in packages
Update README.md
added more data generator tests
added example git hook
fixes #5: handle problematic cases in linspace