Merge pull request #7 from unicomp21/master

fixing a couple issues flagged by dart editor 1.4.2

Author: rhulha

lib/src/node.dart

@@ -24,6 +24,7 @@ class Node extends Spatial {
   Spatial add( Node child)
   {
     children.add( child);
+    return child;
   }
 
   void animate( double elapsed)

lib/src/vector.dart

@@ -189,6 +189,8 @@ class Vector {
     array[0] = _v[0] / _v[3];
     array[1] = _v[1] / _v[3];
     array[2] = _v[2] / _v[3];
+    
+    return true;
   }
 
   String toString() {