Fixed wrong @javaClass annotation for Versions.rsc
Fixed import of resource::versions::git::Git

resource::versions::git::Git had an import of old (?) resource::versions::Scm module.
Replaced with resource::versions::Versions
A new git example that does work on rascal-msr

It contains a small example to iterate over all java files from all commits of a branch.
Merge pull request #1 from kevinvandervlist/master

Allowing rascal-msr to run and include a working example