version 1.2.0:

  - Add a constant YOD_RUNMODE
  - Change the auto running mechanism
  - Change the autoload mechanism
  - Change the config processing logic
  - Add a protected method widget in the class Yod_Controller
  - Add a abstract class Yod_Widget which is derived from Yod_Controller
  - Break up for the class Yod_Model and Yod_DbModel
  - Compatible with ThinkPHP extended libraries
  - Written in C and build as PHP extension
  - Add the class Yod_DbPdo to the Yod extension