Make scripts executable, add shebang lines

setup.sh

@@ -1,3 +1,5 @@
+#! /bin/bash
+
 # A2SERVER master setup script, last update 15-Feb-2015
 # it downloads and executes several scripts related to the setup of
 # netatalk configured for Apple II use on Debian, Raspbian, or Ubuntu.

update.sh

@@ -1,3 +1,5 @@
+#! /bin/bash
+
 currentVersion=124
 
 if [[ -f /usr/local/etc/A2SERVER-version ]]; then