[Matplotlib-devel] switch default to h264

[Eric Firing]

Ryan,

Is there any reason not to switch the animation.codec default to 'h264'? 
  I can make a PR to do this for 2.0 if you approve.  (This is motivated 
by my thrashing around yesterday trying to get an animation to work on 
Linux and Mac.  There were a variety of problems, but my impression is 
that using h264 was one of the keys to success.)

Eric