added timing

Added some code to deal with timed capture. It works but I'm wondering if it's the best way to handle detecting elapsed time. That test loop is a "run as fast as possible" thing and I'm not sure how much processor it's using (although I won't be using the PC while it's running once it's done).

I'm pretty happy with this.

I'm furious that I still can't get the CV module to work in OS X. There will be a very detailed post about that soon.

EDIT: It's worth mentioning that setting the resolution isn't working. I think I need to install the Logitech drivers that may or may not work with Win7.