Will take all the sequences from the current file who's id appears in
        the ids given and place them in the new file path given.

def extract_sequences(self, ids, new_path=None):
        """Will take all the sequences from the current file who's id appears in
        the ids given and place them in the new file path given."""
        # Temporary path #
        if new_path is None: new_fasta = self.__class__(new_temp_path())
        elif isinstance(new_path, FASTA): new_fasta = new_path
        else:                new_fasta = self.__class__(new_path)
        # Do it #
        new_fasta.create()
        for seq in self:
            if seq.id in ids: new_fasta.add_seq(seq)
        new_fasta.close()
        return new_fasta