Use the new BSON methods to prevent buffer overruns

[joeljfischer]

Bug Report

Quoting from another engineer:

You will just need to change all uses of the bson_object_from_bytes function to use the new bson_object_from_bytes_len function, as such:

BsonObject payloadObject = bson_object_from_bytes((BytePtr)data.bytes);

to

BsonObject payloadObject;
int len = bson_object_from_bytes_len(&payloadObject, (BytePtr)data.bytes, data.length);