Don't populate database

Would appreciate someone trying this out. It's based on https://github.com/markjaquith/WordPress-Skeleton, which keeps WordPress in a submodule (See #12). Plugins and Themes are stored in the repo, so anything installed via the WordPress admin will get clobbered when re-deploying, but it could easily be modified so that Plugins and Themes are stored in the OPENSHIFT_DATA_DIR, as suggested in #2.