Tidy the mule-helloworld example

    * Mule helloworld example was moved to regular
    quickstarts project. Fixes #2280.

    * This was achieved by adding bundle type and
    classifier parameters to the fabric8 maven plugin
    (profile zip goal). The classifier parameter was not
    necessary for the mule example, but it seemed logical
    to also offer this feature.

    * All enhancements to the maven plugin are covered
    by tests that use the maven test harness.

    * An archetype was also created for the mule example

    * The archetype permits running the
    autoscale/remote/archetype tests on the mule example,
    which appear to work.