More comprehensive AddToDom logic

I realized I hadn't looked closely enough at the AddToDom logic, and created an error if a canvas was passed to GameConfig without being added to the DOM first. This commit should fix that scenario and move the logic back into AddToDom() where it really belongs

Author: NQNStudios

src/boot/Game.js

@@ -296,11 +296,7 @@ var Game = new Class({
 
         DebugHeader(this);
 
-        // If Phaser had to create its own canvas, add it to the DOM.
-        if (!this.config.canvas)
-        {
-            AddToDOM(this.canvas, this.config.parent);
-        }
+        AddToDOM(this.canvas, this.config.parent);
 
         this.events.emit('boot');
 

src/dom/AddToDOM.js

@@ -36,6 +36,10 @@ var AddToDOM = function (element, parent, overflowHidden)
             target = parent;
         }
     }
+    else if (element.parentElement)
+    {
+        return element;
+    }
 
     //  Fallback, covers an invalid ID and a non HTMLelement object
     if (!target)