Add support for includeResources and includeTestResources

With the 2.11 release of the maven checkstyle plugin two new properties where added: [includeResources and includeTestResources](https://maven.apache.org/plugins/maven-checkstyle-plugin/check-mojo.html). This pull request adds support for these new properties.

It won't work for resource folders with include/exclude defined as described in [MCHECKSTYLE-214](http://jira.codehaus.org/browse/MCHECKSTYLE-214).

BTW: Somebody should really run a cleanup of the source code. For a project called m2e-*code-quality* the indentation, etc. is incredibly inconsistent.