Ceil HTTP offset requests to milliseconds

[jeroen]

This ceiling to milliseconds will fix the issue of the server sometimes returning one keyframe too early. Next, the video stops too early. Very rare issue, but it can be fixed with this small ceil.

[jeroen]

Fixed in [1201] by ceiling time offsets to 1/100 second. As of now, a request like this:

video.mp4?starttime=12.6666666666666

Will be sent as:

video.mp4?starttime=12.67

This will make the server return the keyframe at 12.6666666666666 instead of the previous one (at e.g. 10.53) due to float issues.