Add Travis-CI build badge + update tagline to "External Authentication Module for...

diff --git a/README.md b/README.md
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-# mod-authnz-external
-### Apache External Authentication Module
+# mod-authnz-external [![Build Status](https://travis-ci.org/phokz/mod-auth-external.svg?branch=master)](https://travis-ci.org/phokz/mod-auth-external)
+### External Authentication Module for Apache HTTP Server
 Previous Maintainers: Jan Wolter (http://www.unixpapa.com), Tyler Allison (allison@nas.nasa.gov)
   
 Original Author: Nathan Neulinger (nneul@umr.edu)