Allow the Sage Cell to output a 3D plot using the canvas3d library
Merge remote-tracking branch ‘upstream/master’ into canvas3d

Conflicts:
	sage-patches/01-sage-embedded.patch
Allow canvas3d to use CORS for cross-origin requests

This will still not work for cross-origin requests in IE9
Merge pull request #178 from ihanson/canvas3d

port canvas3d javascript renderer