Merge pull request phaserjs#2878 from stoneman1/master

Fixes issue phaserjs#2860

Author: photonstorm

v2-community/src/animation/AnimationParser.js

@@ -28,6 +28,10 @@ Phaser.AnimationParser = {
     */
     spriteSheet: function (game, key, frameWidth, frameHeight, frameMax, margin, spacing, skipFrames) {
 
+        if (frameMax === undefined) { frameMax = -1; }
+        if (margin === undefined) { margin = 0; }
+        if (spacing === undefined) { spacing = 0; }
+
         var img = key;
 
         if (typeof key === 'string')