Ellipse drawing: now uses the smallest pen and the user defined color.
Zoom in and out with keys Q and W or + and -.
Update README with link to the release section of GitHub repo.
Merge branch 'master' of https://github.com/ENSTABretagneRobotics/VIBES
C++ API allows ellipse drawing from [pos,angle] or [mean,cov]
+ Ellipse are correctly rotated now
I was forgetting the "\n\n" character for drawing ellipses, which prevented from drawing several of them at the same time