SLING-3051 : 'new sling bundle' wizard added to the project. this is based on the org.apache.sling:sling-bundle-archetype archetype - which creates a standalone project without a reactor

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1521472 13f79535-47bb-0310-9956-ffa450edef68