PBJVision, cleanup KVO usage, trigger appropriately
PBJVision, cleanup KVO usage, trigger appropriately

jonesgithub/PBJVision,sebyddd/PBJVision,Bijiabo/PBJVision,medvedNick/PBJVision,rromanchuk/PBJVision,Maciej-Matuszewski/PBJVision,shiflymoon/PBJVision,shenyuan000/PBJVision,zuoguoqing/PBJVision,denivip/PBJVision,rFlex/PBJVision,gary109/PBJVision,smule/PBJVision,yunarta/PBJVision,Raztor0/PBJVision,aaronsakowski/PBJVision,piemonte/PBJVision,smule/PBJVision,jvk75/PBJVision