add shebang lines to all lib files

With gerrit 2.8, and the new change screen, this will trigger syntax
highlighting in gerrit. Thus making reviewing code a lot nicer.

Change-Id: Id238748417ffab53e02d59413dba66f61e724383
diff --git a/stackrc b/stackrc
index ac79889..cb01f21 100644
--- a/stackrc
+++ b/stackrc
@@ -1,3 +1,5 @@
+#!/bin/bash
+#
 # stackrc
 #
 # Find the other rc files