Updating pytest to a more recent development version (2.4.0.dev8).
Merge pull request #139 from oxtopus/pytest-2.4.0.dev8

Updating pytest to a more recent development version (2.4.0.dev8).
modular: numpy - remove source dirs

for linux and MacOS
numpy: use pip install dependency

numpy 1.6.2 was/is used
modular numpy: dont copy files,

pip already instelled them in proper location
numpy installed by pip fix includes
numpy: update to the latest stable version

from 1.6.2 -> 1.7.1
release notes http://sourceforge.net/projects/numpy/files/NumPy/1.7.0/
add source tarball for numpy to pip cache