Rockspec plus some OIDs

... also moving that Makefile out of the way, since it's not even generic enough to adapt when the user isn't installing everything into /usr/local/Cellar or when postgresql isn't in /usr/include or when using luajit or when libpq is in /usr/local/lib, or Windows, or anything really. Not the sort of thing that "just works" that you'd want to leave somewhere where people would actually expect it to be the way to do things.