Fix respond_to? for ruby 2.0
Fix respond_to? for ruby 2.0

Mario245/vanity,mockra/vanity,Futurelearn/vanity,glioinc/vanity,HealthyDelivery/vanity,CGTrader/vanity,glioinc/vanity,Mario245/vanity,mockra/vanity,peterkovacs/vanity,CGTrader/vanity,assaf/vanity,assaf/vanity,peterkovacs/vanity,glioinc/vanity,Futurelearn/vanity,HealthyDelivery/vanity,mockra/vanity,HealthyDelivery/vanity,assaf/vanity,Mario245/vanity,CGTrader/vanity,Futurelearn/vanity,peterkovacs/vanity