Mark only InnoDB as officially supported.
Mark only InnoDB as officially supported.

Closes #299

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