Merge pull request #29 from esc/feature/silence_cowsay

don't echo the command when doing make moo

Makefile

@@ -43,4 +43,4 @@ test:
 	if which git > /dev/null ; then :; else echo "'git' not found, exiting..."; exit 1; fi
 
 moo:
-	if [ -x /usr/games/cowsay ]; then /usr/games/cowsay "I hope you're happy now..."; fi
+	@if [ -x /usr/games/cowsay ]; then /usr/games/cowsay "I hope you're happy now..."; fi