Merge pull request #1 from merwanrambeau/master

Première pull request, enrichissement de la requête de récupération d'un noeud classique, ajout d'attributs type et nom pour le noeud.
Changed type of graph to support loops.
Managing interactions with only one node.
Managing special nodes, normal ones and complexes. Not adding sub entities to complexes for the moment.
NOT WORKING! Creating sub-entities but relations are now bugging.
fixed the while loop on the edge creation?