Add support for skipping frames

[DarwinsBuddy]

Add support for skipping frames (in case videofile has malformed frames)

Add delegate call to get stream dimensions
Replace long polling put queue with built-in blocking wait for put (with configurable timeout on instantiation)

[DarwinsBuddy]

@timgates42 Hi, I wanted to use FileVideoStream to read some go pro footage and process frames with it (as it has a built-in frame buffer). Unfortunately FileVideoStream dropped my video after some frames, as there where unreadable or malformed frames in my file. Skipping over them resolved it. I thought, maybe someone else got the same issues and prefers skipping those frames if they appear. See also added a function returning stream dimensions. cheers ;)