Added messages in all_command.json example for incoming support of more drawing primitive
Wrote message format for drawing ellipses
Ellipse should be drawable by providing (mean,covariance) too. + Added support for drawing ellipses in the viewer.
This commit is not "compilation ready". It adds some messages.
Merge remote-tracking branch 'upstream/master' into adding_ellipse

Conflicts:
	.gitignore
	viewer/tests/all_commands.json
	viewer/vibeswindow.cpp