'This method removes the matching association if it\'s found,
and returns whether the association was removed or not.
@param server_url: The URL of the identity server the
association to remove belongs to.  Because of the way the
server portion of the library uses this interface, don\'t
assume there are any limitations on the character set of
the input string.  In particular, expect to see unescaped
non-url-safe characters in the server_url field.
@type server_url: C{str}
@param handle: This is the handle of the association to
remove.  If there isn\'t an association found that matches
both the given URL and handle, then there was no matching
handle found.
@type handle: C{str}
@return: Returns whether or not the given association existed.
@rtype: C{bool} or C{int}'

def removeAssociation(self, server_url, handle):

    raise NotImplementedError
