Cyclic object basic logging handling

[sakars]

Upon detecting an unserializable object (object has circular references or it contains big integers) prints [ unserializable object ] instead of throwing.
This serves as a simple bandaid solution to #26
Because JSON lacks some aspects of what a javascript object can contain, A complete replacement of JSON.stringify is in order.

[towergame]

#33 makes this obsolete, so I am closing this without merging :P