Updated to include vim swp files.
Can detect balls off a live video feed. The color isn't great; we should
figure out how to calibrate the camera (white balance, nothing
complicated). But even though it doesn't do particularly well at
identifying red pixels it picks out the ball fairly reliably.

The imerically determined constants are still the ones determined for
the reference image. We should make them parameters to the processImage
method and imperically calibrate them for the webcam.

New program usage:
--python cvTest.py ../reference_images/*
----Runs the code on the reference images
--python cvTest.py
----Runs the code from a live video feed

TODO:
--calibrate camera (white balance)
--calibrate camera (imperically determined constants)
--other vision tasks (green ball, distinguish green ball from green
button, find the tower, etc)