functionalities for date and date interval
http://www.virtualenv.org/en/latest/
sudo port install cunit
sudo apt-get install libcunit1 libcunit1-dev
virtualenv --python=/usr/bin/python2.7 python2.7
source python2.7/bin/activate
python setup.py test
make test
valgrind --leak-check=full make test
valgrind --leak-check=full python setup.py test
