added toString()

Author: Achim Brandt

src/main/java/com/arangodb/blueprints/ArangoDBGraph.java

@@ -378,5 +378,4 @@ public ArangoDBSimpleGraphClient getClient() {
 	public String getId() {
 		return simpleGraph.getGraphEntity().getDocumentKey();
 	}
-
 }

src/main/java/com/arangodb/blueprints/client/ArangoDBSimpleGraph.java

@@ -73,4 +73,9 @@ public GraphEntity getGraphEntity() {
 		return graphEntity;
 	}
 
+	public String toString() {
+		return "{\"name\":\"" + getName() + "\",\"vertices\":\"" + getVertexCollection() + "\",\"edges\":\""
+				+ getEdgeCollection() + "\"}";
+	}
+
 }