Export method of jobs now have an props argument to filter exported job properties.

        self['done'] = True

        self['status'] = 'cancelling'

    def export(self):

    def export(self, props=None):

        '''

        Export the job in a simple dict format.

        '''

        exported = {}

        for key, val in self.iteritems():

            if key.startswith('_'):

            if key.startswith('_') or (props is not None and key in props):

                continue

            if isinstance(val, datetime):

                now = datetime.now()