Adds proper OpenCV seeking #163
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This code adds real seeking, rather than looping over grab. This should speed up seeking in large files significantly.
However, the final grab at the end of the method should also be removed, only reason I left it in was because PySceneDetect's grab function seems to be doing something under the hood that I couldn't figure out to do with start_time or _curr_time. So someone with more exposure to this code should take a quick look to remove it.