Add myself (jtl / Jonathan T. Looney) as a src committer:

- Add authors.ent entity
- Add email to contrib.committers.xml
- Add news item to news.xml (and cleanup the extra month container)
- Add PGP key

Approved by:	gnn (mentor)
Differential Revision:	https://reviews.freebsd.org/D4028

en_US.ISO8859-1/articles/contributors/contrib.committers.xml

@@ -826,6 +826,10 @@
       <para>&a.scottl.email;</para>
     </listitem>
 
+    <listitem>
+      <para>&a.jtl.email;</para>
+    </listitem>
+
     <listitem>
       <para>&a.imp.email;</para>
     </listitem>