Cleanup compatibility warnings with the verifier

[jwren]

Cleanup compatibility warnings with the verifier:

  Compatibility warnings (1): 
      #Plugin bundles IDE packages
          The plugin distribution bundles IDE packages 'org.jetbrains.idea.maven.wizards', 'org.jetbrains.idea', 'org.jetbrains.idea.maven'. Bundling IDE packages is considered bad practice and may lead to sophisticated compatibility problems. Consider excluding these IDE packages from the plugin distribution. If your plugin depends on classes of an IDE bundled plugin, explicitly specify dependency on that plugin instead of bundling it.