* fixed bug when UIKit will call the completion block if there aren't any view animations in the animations block * added fill mode options * wrapped animation completion block
* fixed bug when UIKit will call the completion block if there aren't any view animations in the animations block
* added fill mode options
* wrapped animation completion block

ramoslin02/EasyAnimation,stvvan/EasyAnimation,tuanphung/EasyAnimation,icanzilb/EasyAnimation,icanzilb/EasyAnimation,bestwpw/EasyAnimation,ArthurKK/EasyAnimation,bestwpw/EasyAnimation,stvvan/EasyAnimation,tuanphung/EasyAnimation,ramoslin02/EasyAnimation,ArthurKK/EasyAnimation