This project is setup using IDEA Community. You'll have to download and install a sun/oracle jdk to get it to run correctly.

Get the IDE and point it at the repo dir (it should detect the .idea meta data).
Once you open the project in IDEA, go to Build > build 'cartography' artifact to produce the plugin jar (in out/artifacts/...).

To test the plugin, see the bukkit wiki on getting and running the bukkit server.
Symlink or copy the plugin jar file into the bukkit server's plugins directory.

When the file relay is hooked up, it's going to try and dump text files with block id lists in them to
<bukkit dir>/tiles, so try to ensure that dir exists.