Related Documents Plugin should provide compound bean class (currently in demo)

The related documents plugin provides a compound type "relateddocs:docs" with corresponding editor plugin.

A corresponding bean class should also be provided by the plugin. This bean exists but currently lives in the related documents demo and must be copy-pasted from there to a new project:

https://svn.onehippo.org/repos/hippo/hippo-cms7/plugins/relateddocs/demo/trunk/site/src/main/java/org/onehippo/forge/beans/RelatedDocsBean.java

This is silly for the following reasons:

• code duplication in projects
• risk of outdated bean living on in projects
• more documentation needed (copy paste bean from demo, etc.)