[RAT-168] Add integration test for apache-rat:rat to catch NPE
Use the correct annotation for this kind of @Parameter. The "property" option is used for parameters that can be set from the command line as a system property using -D, but this parameter is read only so we should not use that. Instead we want the parameter to have a default value injected with the current project. The IT (it4_RAT-168) that was added for this issue still passes with this change.

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/trunk@1618026 13f79535-47bb-0310-9956-ffa450edef68
Simplify invoker goals.

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/trunk@1618027 13f79535-47bb-0310-9956-ffa450edef68
Fix typo.

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/trunk@1618034 13f79535-47bb-0310-9956-ffa450edef68
Inject project version and name from the POM, so that we don't have to update these for every new release.
I also tried to inject the project artifactId, but that won't work currently, because our artifactIds are not quite right. I will revisit that in a later version.

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/trunk@1618038 13f79535-47bb-0310-9956-ffa450edef68