install: check if formula is already linked before fetching
install: check if formula is already linked before fetching

MikeMcQuaid/brew,MikeMcQuaid/brew,JCount/brew,nandub/brew,Homebrew/brew,EricFromCanada/brew,EricFromCanada/brew,Homebrew/brew,EricFromCanada/brew,JCount/brew,nandub/brew,Homebrew/brew,JCount/brew,MikeMcQuaid/brew,EricFromCanada/brew,Homebrew/brew,JCount/brew,MikeMcQuaid/brew,nandub/brew,nandub/brew