2012-06-18: use bash

use bash

diff --git a/setup_infocalypse_on_linux.sh b/setup_infocalypse_on_linux.sh
--- a/setup_infocalypse_on_linux.sh
+++ b/setup_infocalypse_on_linux.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # Install and prepare infocalypse on your system.