Fixed language level configuration.
Thanks to Jonny Heggheim at Vizrt.com
Fixed signing an incomplete uri (missing expiry and appkey).
Throw an exception if the istribute api returns a json error object.
Oops: Check for containsKey("error")
Throw invalid response exceptions if the response for a video upload contains something else than what we expect.
Fix signing of posts.
Video and VideoList was not completely implemented.