Install brew-cask pkgs before brew

Because "ttfautohint" depends on "xquartz"
Install f.lux
Use execution method which allows stdin
Merge pull request #28 from njam/issue-28

Use execution method which allows stdin
Merge pull request #26 from njam/issue-26

Install brew-cask pkgs before brew
Merge pull request #27 from njam/issue-27

Install f.lux
Merge branch 'master' of github.com:cargomedia/osx-setup into local-dns

Conflicts:
	README.md