Add elm cpu cores Travis workaround from https://github.com/elm-lang/elm-compiler/issues/1473#issuecomment-245704142
Add elm cpu cores Travis workaround from https://github.com/elm-lang/elm-compiler/issues/1473#issuecomment-245704142

macacollins/elm-vim,macacollins/elm-vim,macacollins/elm-vim