set fixed output timestamp to fix m-artifact-p error

Author: Sebastian Hoß

pom.xml

@@ -91,6 +91,7 @@
     <properties>
         <version.jdk>${javaVersion}</version.jdk>
         <scmTag>HEAD</scmTag>
+        <project.build.outputTimestamp>2016-01-01T12:00:00+00:00</project.build.outputTimestamp>
     </properties>
 
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