This class forces video to load on 100% and informs about it's load progress.
Important notes:
- Google Chrome requires your web server to be capable of serving the document using byte ranges (see http://stackoverflow.com/questions/4572720/html5-video-tag-in-chrome-why-is-currenttime-ignored-when-video-downloaded-fro)
- Load progress is calculated in percents rounded to int because IE and FF never give
buffered / videoDuration == 100
. Even rounding to precision of 2 fails in IE