fix some xml bug
fix some xml and bson bug (#2) * add encoder wrapper and support bson * fix atoi bug when val==0 and exception in xml decode when use M in case of empty string * encoder object end add key
fix some xml and bson bug (#2) * add encoder wrapper and support bson * fix atoi bug when val==0 and exception in xml decode when use M in case of empty string * encoder object end add key