class.lua
Added getProperty method that allow user to get custom property value. this method is used on atween
Refactored setProperty method
Now register:tween{} can add Ended, OnStepped. argments are same with atween but added item(pointing it self) as first argment
round.lua
Added getRound, getOutline method, this method is used on getProperty
atween/index.lua
Added Setter,Getter option on runTween/s
