SLING-2989 - [Tooling] integrate with vlt once available

vlt-wrapper: add more package imports

git-svn-id: https://svn.apache.org/repos/asf/sling/branches/tooling-ide-vlt@1520308 13f79535-47bb-0310-9956-ffa450edef68
SLING-2989 - [Tooling] integrate with vlt once available

JcrCommand: use session.save()

git-svn-id: https://svn.apache.org/repos/asf/sling/branches/tooling-ide-vlt@1520310 13f79535-47bb-0310-9956-ffa450edef68
SLING-2989 - [Tooling] integrate with vlt once available

First implementation of the AddNodeCommand.

git-svn-id: https://svn.apache.org/repos/asf/sling/branches/tooling-ide-vlt@1520311 13f79535-47bb-0310-9956-ffa450edef68