Load signatures from a file.

        @fname - Path to signature file.

        Returns None.

def load(self, fname):
        '''
        Load signatures from a file.

        @fname - Path to signature file.

        Returns None.
        '''
        # Magic files must be ASCII, else encoding issues can arise.
        fp = open(fname, "r")
        lines = fp.readlines()
        self.parse(lines)
        fp.close()