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.
You can consider to put each 'block' of the loop in a separate function and then just call the functions in your loop. This improves readability.