fix build error in spec with sinatra
fix build error in spec with sinatra

The error was 'NameError: uninitialized constant Kaminari::ActionViewExtension'.

barkbox/cursor,Zhomart/kaminari,danimashu/kaminari,jcoyne/kaminari,onursarikaya/kaminari,royels/kaminari,jiamaozheng/kaminari,dblock/kaminari,epicagency/kaminari,royels/kaminari,amatsuda/kaminari,guodongme/kaminari,kaminari/kaminari,yui-knk/kaminari,JuanitoFatas/kaminari,Teino1978-Corp/Teino1978-Corp-kaminari,dblock/kaminari,pat/kaminari,Boomkat/kaminari,iberianpig/kaminari,kaminari/kaminari,sendgrid/kaminari,antstorm/kaminari,thiagorp/kaminari,sr-education/kaminari,parity/kaminari,bsboris/kaminari,amatsuda/kaminari,Zhomart/kaminari,sendgrid/kaminari,sanrodari/kaminari,wkirschbaum/kaminari,yui-knk/kaminari,jiamaozheng/kaminari,parity/kaminari,joe1chen/kaminari,pat/kaminari,onursarikaya/kaminari,Boomkat/kaminari,sideci-sample/sideci-sample-kaminari,antstorm/kaminari,iberianpig/kaminari,mperrando/kaminari,sachin21/kaminari,danimashu/kaminari,sendgrid/kaminari,guodongme/kaminari,bonekost/kaminari,epicagency/kaminari,mrstif/cursor,bonekost/kaminari,JuanitoFatas/kaminari,thiagorp/kaminari,varvet/kaminari,aelogica/kaminari,mperrando/kaminari,sanrodari/kaminari,peter-umb/umbie_kaminari,Teino1978-Corp/Teino1978-Corp-kaminari,peter-umb/umbie_kaminari,fkagami/kaminari,plribeiro3000/kaminari,joe1chen/kaminari,wkirschbaum/kaminari,mrhead/kaminari,bsboris/kaminari,plribeiro3000/kaminari,varvet/kaminari,mrhead/kaminari,aelogica/kaminari,sachin21/kaminari,sr-education/kaminari