eliminate duplicate validation of presence for username
eliminate duplicate validation of presence for username

nyc-dragonflies-2015/hack-overflow,tgoldenberg/hack-overflow,tgoldenberg/hack-overflow,tekd/hack-overflow,nyc-dragonflies-2015/hack-overflow,tekd/hack-overflow,tekd/hack-overflow,tgoldenberg/hack-overflow,nyc-dragonflies-2015/hack-overflow