Created a rockspec for defining dependencies.
Created "rockler" a little command akin to bundle exec

./rockler   run `luarocks make` pointing at the vendor directory, and
            to the luarocks and moonrocks servers.

./rockler love .  run love for the current directory, with LUA_PATH set
                  so it finds the vendored rocks.

./rockler [cmd]
./rockler busted  run [cmd]/busted with LUA_PATH set and PATH including
                  ./vendor/bin
Vendorise busted dependency
Update LUA_PATH to include our own vendored files

It looks like we also need to include our own non-vendored files in
LUA_PATH too. Needs more investigation.