Consume all the bytes from a file like object.

        Example:

            hset = HashSet()
            hset.eatfd(fd)

def eatfd(self, fd):
        '''
        Consume all the bytes from a file like object.

        Example:

            hset = HashSet()
            hset.eatfd(fd)

        '''
        fd.seek(0)
        byts = fd.read(10000000)
        while byts:
            self.update(byts)
            byts = fd.read(10000000)

        return self.guid()