* Introduces explicit mode of stub downloading
you have to explicitly provide the mode [CLASSPATH, REMOTE, LOCAL] of how you want to fetch and register stubs
fixes gh-287
without this feature we're missing an option to print all mappings registered for servers
with this feature it will be much easier to debug what was registered in which http server stub. The mappings will be dumped to files with name artifactName_registeredPort
fixes#355
without this change there's no option to use Stub Runner to pick stubs from classpath
with this change we're adding that option. It's enough for the user not to provide neither the `repositoryRoot` nor `workOffline`. If that's the case then Classpath scanning will take place.
fixes#282
