SLING-3592 - Remove embedded bundle archetype in favour of released
version

- no longer embed a bundle archetype
- better tracing and error reporting for the bundle wizard page
- only accept sling-bundle-archetype 1.0.2 or newer ( SNAPSHOTS included
)

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1604495 13f79535-47bb-0310-9956-ffa450edef68