Added check to detect if updateevent attribute is an array and apply watchers for each event found.
Added check to detect if updateevent attribute is an array and apply watchers for each event found.

SamGraber/angular-bootstrap-slider,kranthitech/angular-bootstrap-slider,seiyria/angular-bootstrap-slider,seiyria/angular-bootstrap-slider,kranthitech/angular-bootstrap-slider,sagoAguilar/angular-bootstrap-slider,hristozov/angular-bootstrap-slider,matiasdelgado/angular-bootstrap-slider,j-a-m-l/angular-bootstrap-slider,hristozov/angular-bootstrap-slider,sagoAguilar/angular-bootstrap-slider,j-a-m-l/angular-bootstrap-slider,matiasdelgado/angular-bootstrap-slider,SamGraber/angular-bootstrap-slider