Merge branch 'master' of https://github.com/Team254/CheesyVision
Avoid busy-waiting when not getting images.

If we're waiting for a webcam to boot, it would end up in a busy loop and peg the CPU.
Merge pull request #3 from bsilver8192/master

Avoid busy-waiting when not getting images.
Merge branch 'master' of https://github.com/Team254/CheesyVision
Merge branch 'master' of https://github.com/FRC3161/CheesyVision into experimental