Fix a TODO concerning Python-detection. We now check PATH first 

This fixed a TODO in your code regarding the detection of python. I am not sure if this is to right way to send you this patch, so sorry for any inconveniences.

There are a few Error-conditions I can't filter for, like people having multiple Python2-executables in their PATH or people having no version indicator associated with their Python-path, but trying to fix/check those, the cure would probably worse that this just not working.

I have only tested this code on Win8 on 64-bit, so this should be reviewed.