Reset java.version to 1.6.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/maven@1734039 13f79535-47bb-0310-9956-ffa450edef68

pom.xml

@@ -17,7 +17,7 @@
     <exec.plugin.version>1.4.0</exec.plugin.version>
     <findbugs.plugin.version>3.0.1</findbugs.plugin.version>
     <jar.plugin.version>2.6</jar.plugin.version>
-    <java.version>1.7</java.version>
+    <java.version>1.6</java.version>
     <junit.version>4.11</junit.version>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.info.reports.plugin.version>2.8</project.info.reports.plugin.version>