Fix eitherDecode functions (gh-142)
Fix eitherDecode functions (gh-142)

plaprade/aeson,neobrain/aeson,roelvandijk/aeson,aelve/json-x,neobrain/aeson,sol/aeson,abbradar/aeson,nurpax/aeson,SeanRBurton/aeson,bwo/aeson,sol/aeson,beni55/aeson,sol/aeson,lykahb/aeson,timmytofu/aeson,dmjio/aeson,roelvandijk/aeson,23Skidoo/aeson,jkarni/aeson,JPMoresmau/aeson