'Quote values so they can be safely represented in a VCard.
>>> print VCardLine.Quote(\'Comma, semicolon; backslash\ newline\n\')
Comma\, semicolon\; backslash\\ newline\n'

@classmethod
def Quote(self, text):

    return unicode(''.join([self.QUOTE_MAP.get(c, c) for c in text]))
