Get version info via REST GET call

[chadlung]

Atom Nuke should have a way to retrieve the current version of the project while running - similar to Atom Hopper: https://github.com/rackspace/atom-hopper/blob/master/hopper/src/main/java/org/atomhopper/AtomHopperVersionServlet.java

This allows other services or a dashboard to query the product and retrieve the version info and display accordingly.

[zinic]

Work has started on this. The feature will be provided via a default servlet that will come with the Jetty service. In addition, the core jar contains the version info, allowing anything that links to the jar to expose the version of Nuke being utilized. This feature is important for exposing version information via the CLI tool.