Pin ruby version

Pin ruby version to 1.9.3 to make heroku consistent with tests. See detailed commit message e275140d633673ff6173f613e3b92a16d0de2ec8

Also changes unix file mode of mergupstream.sh to make it executable (Github won't let me make a pull request for a file mode change on its own.)

This branch temporarily deployed at http://localsupport-northumbria.herokuapp.com/ for evaluation