Video block overhaul. Kept the old flash stuff since we need the fallbac...

...k anyway. Still need to check it on IE8 on windows. Fingers crossed!!!

One thing I did notice that's funky is that on the asset library helper, once you've supplied a file, you can't scroll over it. It eats your scroll. Also, it seems like it extends way off itself, particularly over block save buttons. I think there are some issues made for click proxies but thought I'd bring that to attention. Also, using the video deal for the asset library, the video icon is ginormous for some reason?  Re: #770