#14 Support maven-pmd-plugin exclude's configuration from pom

[Anonymous]

For some reason, one may disable PMD checking on some files.
With the maven-pmd-plugin, he can do this by "excludes" or "excludeRoots" configuration (http://maven.apache.org/plugins/maven-pmd-plugin/pmd-mojo.html#excludes)
So this works well under maven, but in Eclipse, excluded files remains in red, which is annoying