Issue66

Found only a bug in the main where centLensx/y must be an array instead of a list. When this was solved the mainWFS.py worked without any errors. Also included a test function and made some adjustments to the mainWFS.py regarding the number of samples the intensity distribution has.
Ok, this could be a bug inside the SciPy version which I have running here. Will try to have the last version of everything running here.

My comment about not commiting these changes into pull requests however remains.