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 `mergeupstream.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