Add aframe-livereload-image

[naugtur]

https://github.com/naugtur/aframe-livereload-image

It's functional already, but I'm hoping to extend it a bit further.

I've removed the link to example because opening it tells you nothing and it generates useless traffic.
Once I add support for livereload based on http headers (if not on file:// protocol) I can create a glitch example site that'd serve a different image every 20 seconds.

But in general, this tool is useful for artists painting straight onto a panorama file.