Format source code
Refactor, remove .Code attribute from Event Class
Change the way to create an event instance, since there could be two events share the same event class, e.g. UPDATE_ROWS_EVENT_V1 & UPDATE_ROWS_EVENT_V2
Refactor, move definition of ZongJi#start out of method 'connect'
Refactor, make binlog event contructor with a shorter list of params
Bump version 0.1.2