documentation for the maven-inherit-plugin

I've uploaded some documentation for the maven-inherit-plugin in the usual format:

http://www.ops4j.org/projects/pax/construct/maven-inherit-plugin

and improved the code to use custom Javadoc tags to get the extended plugin details.

For example:

  /**
  * @extendsPlugin archetype
  * @extendsGoal create
  * @goal create-project
  * @requiresProject false
  */
  public class OSGiProjectArchetypeMojo extends MavenArchetypeMojo
  {
    // if you override member fields, remember to propagate the values using reflection
  }