Control.Lens.Each: Add Identity, Maybe, Either instances
Control.Lens.Each: Add Identity, Maybe, Either instances

ddssff/lens,Fuuzetsu/lens,hvr/lens,Gabriel439/lens,cdepillabout/lens,cchalmers/lens,omefire/lens,hvr/lens,Icelandjack/lens,rpglover64/lens,danidiaz/lens,timjb/lens