Python的MongoDB驱动，Motor 0.2.1 发布

Motor的 0.2.1 版本发布，Python 和 Tornado 的异步 MongoDB 驱动器。它修复了两个bugs:

• MOTOR-32: The documentation claimed that MotorCursor.close immediately halted execution of MotorCursor.each, but it didn't. MotorCursor.each() is now halted correctly.
• MOTOR-33: An incompletely iterated cursor's __del__ method sometimes got stuck and cost 100% CPU forever, even though the application was still responsive.