Added update_video and fixed a bug with Video object. Closed by aa8622c5c600d2d9fcb11b1a3ee43101d738c23f
bug fix on Video object was making videoFullLength a single and optional rendition object
where it had been made an array of a single Rendition object based on some of the sample
code that I had read.
also modified the _post method to handle both file post for create_video as we asll non-
multipart form encoded posts for other POST api calls.
Added update_video and fixed a bug with Video object. Closed by aa8622c5c600d2d9fcb11b1a3ee43101d738c23f