Do not ignore pause requests if not playing
If play had been called on the NetStream but playback had not actually begun, calling pause() on the HTTPVideoProvider was silently ignored. Instead, always pause the NetStream which shouldn't be harmful if the video is already paused. The additional mutation performed by this method was left unaltered.
Merge pull request #60 from dmlap/hotfix/dropped-pause

Do not ignore pause requests if not playing