added clone function to Line

Author: beeglebug

src/geom/Line.js

@@ -182,6 +182,27 @@ Phaser.Line.prototype = {
 
         return results;
 
+    },
+
+    /**
+     * Returns a new Line object with the same values for the start and end properties as this Line object.
+     * @method Phaser.Line#clone
+     * @param {Phaser.Line} output - Optional Line object. If given the values will be set into the object, otherwise a brand new Line object will be created and returned.
+     * @return {Phaser.Line} The cloned Line object.
+     */
+    clone: function (output) {
+
+        if (typeof output === "undefined" || output === null)
+        {
+            output = new Phaser.Line(this.start.x, this.start.y, this.end.x, this.end.y);
+        }
+        else
+        {
+            output.setTo(this.start.x, this.start.y, this.start.x, this.start.y);
+        }
+
+        return output;
+
     }
 
 };