shell: Set Cabal home directory to front of /Users/jeffbr/.rbenv/bin:/usr/local/heroku/bin:/Users/jeffbr/.cabal/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/Users/jeffbr/code/android-sdk/tools:/Users/jeffbr/code/android/platform-tools.