Apply default X/Y-Spacing

Applies default X/Y-Spacing when omitted as a parameter

Author: nlotz

src/loader/Cache.js

@@ -451,7 +451,10 @@ Phaser.Cache.prototype = {
             font: null,
             base: new PIXI.BaseTexture(data)
         };
-
+        
+        if (xSpacing === undefined) { xSpacing = 0; }
+        if (ySpacing === undefined) { ySpacing = 0; }
+        
         if (atlasType === 'json')
         {
             obj.font = Phaser.LoaderParser.jsonBitmapFont(atlasData, obj.base, xSpacing, ySpacing);