In order for this to work properly if you were to clone it, you must download and install mongodb (you must download homebrew to do it this way)
$ brew install mongodb
and create a direcotry for mongodb
$ mkdir -p /data/db
and then run
$ mongod
or $ mongod --httpinterface
The port will be at 27017 (and 28017 with the httpinterface flag) by default.