title: Can't draw line using CC3LineNode in cocos3d
body: <p>i am a newbie in cocos3d. I wan to draw a line using cc3linenode.</p>
  
  <p>Here is the code</p>
  
  <pre><code>float arr_location[] = {x,y,z, dx,dy, dz };
  CC3LineNode* lineNode = [CC3LineNode nodeWithName: @"Line test"];
  [lineNode populateAsLineStripWith: 2
                           vertices: arr_location
                          andRetain: YES];
  lineNode.color = ccGREEN;
  
  [_lines addObject:lineNode];
  [_activeWorld addChild:lineNode];
  </code></pre>
  
  <p>But when i try this, i get an error like this</p>
  
  <pre><code>Instance method populateAsLineStripWith: vertices: andRetain: is not found(return type defaults to 'id')
  </code></pre>