Client : add method drawQuadTree

Signed-off-by: Jean-François Erdelyi <jean-francois.erdelyi@etu.iut-tlse3.fr>
Merge branch 'master' of git://github.com/sebhtml/Ray-Cloud-Browser
Client : add methode to print a QuadTree on the screen

Signed-off-by: Jean-François Erdelyi <jean-francois.erdelyi@etu.iut-tlse3.fr>
Reviewed-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
Resolves-bug: https://github.com/sebhtml/Ray-Cloud-Browser/issues/7