avoid snowballing - add exits codes

runansible

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/bash -e
 # copy var files to /etc/iiab for subsequent use
 # if vars/local_vars.yml is missing, put a default one in place
 if [ ! -f ./vars/local_vars.yml ]; then
@@ -14,7 +14,7 @@ if [ ! -f ./vars/local_vars.yml ]; then
         ;;
         *)
         echo "IIAB supports raspbian, debian, ubuntu, centos, and OLPC - exiting now..."
-        exit 0
+        exit 1
         ;;
     esac
 fi
@@ -33,7 +33,7 @@ then
  echo "IIAB Playbook not found."
  echo "Please run this command from the top level of the git repo."
  echo "Exiting."
- exit
+ exit 1
 fi
 
 if [ ! -f /etc/ansible/facts.d/local_facts.fact ]; then