avoid huge and growing number of rendered videos in git
@jimmac
Submitted by Jakub Steiner Link to original bug (#699998)
Description
It is starting to be a showstopper to keep on adding the rendered webm files directly into the source tree. I think the autogunk should by default wget the rendered webm files from somewhere I'll render them to and optionally with a configure switch (--render) use blender to render them locally.