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

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