added whenever_variables as a configuration variable
added whenever_variables as a configuration variable

javan/whenever,rafaelsales/whenever,erikdahlstrand/whenever,bernabas/whenever,thehungrycoder/whenever,sideci-sample/sideci-sample-whenever,medictrust/whenever,ThomasPr/whenever,Insomniware/whenever,Dearest/whenever,stpn/whenever,makandra/whenever,shtzr840329/whenever,ctokoro/whenever,attilahorvath/whenever,betesh/whenever,Nguyenanh/whenever,bangwu/whenever,mindvalley/whenever,HonoreDB/whenever,TechieDev/whenever,lzheng571/whenever