5.0.1 (May 19, 2015)

• Fixes stringify to only take ancestors into account when checking circularity.
  It previously assumed every visited object was circular which led to [false positives][issue9].
  Uses the tiny serializer I wrote for [Must.js][must] a year and a half ago.
• Fixes calling the replacer function in the proper context (thisArg).
• Fixes calling the cycleReplacer function in the proper context (thisArg).
• Speeds serializing by a factor of Big-O(h-my-god-it-linearly-searched-every-object) it had ever seen. Searching only the ancestors for a circular references speeds up things considerably.