0.1: Geometry is OK (05/2011)
0.2: Azimuthal integration using cython histogramming is working (07/2011)
0.3: Azimuthal integration splits pixels like fit2d (11/2011)
0.4: global clean up of the code regarding options from command line and better design
     correct the orientation of the azimuthal angle chi
     rename scripts in pyFAI-calib, pyFAI-saxs and pyFAI-waxs 
0.5: include OpenCL version of azimuthal integration