Update coveralls config.

Removed the manipulation of the <maven.buildNumber.timestampFormat>
property used by the buildnumber maven plugin. This will now default to
using EpochMillis.
diff --git a/pom.xml b/pom.xml
index 70581cb..a8e4156 100644
--- a/pom.xml
+++ b/pom.xml
@@ -79,8 +79,12 @@
     <geometry.jgit.buildnumber.version>1.2.10</geometry.jgit.buildnumber.version>
     <implementation.build>${git.revision}; ${maven.build.timestamp}</implementation.build>
 
-    <!-- Override default buildNumber timestamp format, needed for coveralls plugin -->
-    <maven.buildNumber.timestampFormat>{0,date,yyyy-MM-dd HH:mm:ssZ}</maven.buildNumber.timestampFormat>
+    <!-- Override default buildNumber timestamp format, needed for coveralls plugin 
+
+       Commented out for a test of coveralls. The format for the ${timestamp} property will be EpochMillis
+       and this is configured in the coveralls profile.
+    -->
+    <!--  <maven.buildNumber.timestampFormat>{0,date,yyyy-MM-dd HH:mm:ssZ}</maven.buildNumber.timestampFormat> -->
 
     <!--
         Override so that "mvn commons:download-page" will generates a web page