Merge pull request #2 from drye/master

The chkcrontab script doesn't exit with the proper error code

chkcrontab

@@ -40,4 +40,4 @@ def main(argv):
   return check.check_crontab(argv[1], log)
 
 if __name__ == '__main__':
-  main(sys.argv)
+  sys.exit(main(sys.argv))