'Check if project_name need update'

def _need_update(self, project_name, updatetime=None, md5sum=None):

    if (project_name not in self.projects):
        return True
    elif (md5sum and (md5sum != self.projects[project_name]['info'].get('md5sum'))):
        return True
    elif (updatetime and (updatetime > self.projects[project_name]['info'].get('updatetime', 0))):
        return True
    elif ((time.time() - self.projects[project_name]['load_time']) > self.RELOAD_PROJECT_INTERVAL):
        return True
    return False
