changing in artifact namespace break josman

[DavidLeoni]

For josman-maven-plugin we changed the namespace, which causes exceptions like the reported one.
A workaround in the immediate can be to just ignore past versions, at the cost of not publishing past documentation anymore...

Caused by: java.io.FileNotFoundException: http://repo1.maven.org/maven2/eu/trentorise/opendata/josman-maven-plugin/0.6.1/josman-maven-plugin-0.6.1-javadoc.jar
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1625)
        at org.apache.commons.io.FileUtils.copyURLToFile(FileUtils.java:1419)
        at eu.trentorise.opendata.josman.Josmans.fetchJavadoc(Josmans.java:566)
        ... 25 more