[MRESOURCES-297] Update to parent POM 39, reformat #55
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Slight change introduced in src/it/includeEmptyDirs that used ".gitattributes" as placeholder, but that file is not excluded anymore with latest plexus-utils. Sources and javadoc adapted, IT fixed to use "._placeholder" instead.
https://issues.apache.org/jira/browse/MRESOURCES-297