Utility function to dump the messages in a queue to a file
        NOTE: Page size must be < 10 else SQS errors

def dump(self, file_name, page_size=10, vtimeout=10, sep='\n'):
        """Utility function to dump the messages in a queue to a file
        NOTE: Page size must be < 10 else SQS errors"""
        fp = open(file_name, 'wb')
        n = 0
        l = self.get_messages(page_size, vtimeout)
        while l:
            for m in l:
                fp.write(m.get_body())
                if sep:
                    fp.write(sep)
                n += 1
            l = self.get_messages(page_size, vtimeout)
        fp.close()
        return n