Windows requires version numbers in opencv library names

[auscompgeek]

Originally posted by @auscompgeek in #17 (comment):

Edit setup.py so the opencv library names are versioned (e.g. append 342 to each of them - look in %LIB% for the version number).

This really shouldn't be necessary for someone to compile this on Windows. Our setup.py should add the version to the library names.

The appropriate string to append should be the result of the expression cv2.__version__.replace(".", "").