Returns json feed.

def parse_json(self, page):
        '''Returns json feed.'''
        if not isinstance(page, basestring):
            page = util.decode_page(page)
            
        self.doc = json.loads(page)
        results = self.doc.get(self.result_name, [])
    
        if not results:
            self.check_status(self.doc.get('status'))
            return None
            
            
        return results