use prototypal inheritance for observers
use prototypal inheritance for observers

pingjiang/ractive,Rich-Harris/ractive,aliprogrammer69/ractive,cgvarela/ractive,ractivejs/ractive,pingjiang/ractive,dyx/ractive,thomsbg/ractive,JonDum/ractive,Rich-Harris/ractive,Rich-Harris/ractive,ndimas/ractive,heavyk/ractive,ractivejs/ractive,ISNIT0/ractive,pingjiang/ractive,magicdawn/ractive,ISNIT0/ractive,ndimas/ractive,dyx/ractive,npmcomponent/RactiveJS-Ractive,marcalexiei/ractive,marcalexiei/ractive,thomsbg/ractive,marcalexiei/ractive,thomsbg/ractive,magicdawn/ractive,p0lax/ractive,magicdawn/ractive,cgvarela/ractive,cgvarela/ractive,ISNIT0/ractive,dyx/ractive,p0lax/ractive,aliprogrammer69/ractive,squaredup/ractive,aliprogrammer69/ractive,JonDum/ractive,JonDum/ractive,ndimas/ractive,npmcomponent/RactiveJS-Ractive,heavyk/ractive,heavyk/ractive,ractivejs/ractive,squaredup/ractive,squaredup/ractive