closes #124

Add a class that wraps the CategoryPublisher application.
Add a test class that tests a basic scenario involving the FeaturesAndBundlesPublisher
and CategoryPublisher application.
Testing the CategoryPublisher without the FeaturesAndBundlesPublisher would require
to create eclipse metadata manually. Therefore, both applications are used.

Even if the the documentation lists the argument categoryQualifier without an additional URL argument,
I implemented it with an URL because of the application's implementation expects an argument.