Add changes needed on Mac OSX. To be able to use the G4 Python interface on OSX, the G4 libs need to end on .so and not .dylib. Fixes #40.
Skeleton for a make clean tool.
Complete skeleton is ready.
Create config.cache also for automatic, grid and onlyreco. The file is needed for the new make_clean script.
Create build dir inside of the geant4 dir.