use last wagon version.

pom.xml

@@ -342,7 +342,7 @@ THE SOFTWARE.
     <mavenVersion>3.0.1</mavenVersion>
     <maven.version>${mavenVersion}</maven.version>
     <aetherVersion>1.8</aetherVersion>
-    <wagonVersion>1.0-beta-6</wagonVersion>
+    <wagonVersion>1.0-beta-7</wagonVersion>
     <!-- *.html files are in UTF-8, and *.properties are in iso-8859-1, so this configuration is acturally incorrect,
     but this suppresses a warning from Maven, and as long as we don't do filtering we should be OK. -->
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>