Get transmissions sent along this Vector.

        Status can be "all" (the default), "pending", or "received".

def transmissions(self, status="all"):
        """Get transmissions sent along this Vector.

        Status can be "all" (the default), "pending", or "received".
        """
        if status not in ["all", "pending", "received"]:
            raise(ValueError("You cannot get {} transmissions."
                             .format(status) +
                             "Status can only be pending, received or all"))

        if status == "all":
            return Transmission\
                .query\
                .filter_by(vector_id=self.id,
                           failed=False)\
                .all()
        else:
            return Transmission\
                .query\
                .filter_by(vector_id=self.id,
                           status=status,
                           failed=False)\
                .all()