GHC 7.4 support
GHC 7.4 support

mkscrg/persistent,greydot/persistent,pseudonom/persistent,meteficha/persistent,rdnetto/persistent,mitchellwrosen/persistent,naushadh/persistent,mitchellwrosen/persistent,jcristovao/persistent,jcristovao/persistent,superduper/persistent,andrewthad/persistent,jasonzoladz/persistent,junjihashimoto/persistent,superduper/persistent,jasonzoladz/persistent,andrewthad/persistent,greydot/persistent,creichert/persistent,paul-rouse/persistent,jcristovao/persistent,pseudonom/persistent,junjihashimoto/persistent,meteficha/persistent,bitemyapp/persistent,nakaji-dayo/persistent,rdnetto/persistent,psibi/persistent,mitchellwrosen/persistent,erikd/persistent,gbwey/persistent,plow-technologies/persistent,andrewthad/persistent,nakaji-dayo/persistent,gbwey/persistent,greydot/persistent,mkscrg/persistent,superduper/persistent,yesodweb/persistent,meteficha/persistent,jasonzoladz/persistent,nakaji-dayo/persistent,gbwey/persistent,mkscrg/persistent