MORE INFORMATION HERE http://forums.bukkit.org/threads/115810/
1) Create new folder for new module
2) Create new pom.xml for that folder (base it on existing implementation module poms)
3) Implement the interface at org.kitteh.example.plugin.nms.v1_7_R1.NMSHandler
4) Add reference in parent pom.xml
5) Add dependency in Plugin/pom.xml
6) Build!
You may use any of this in your own plugin. I would prefer that you give me some form of credit but that is not necessary.
I'm just happy to contribute toward better compatibility in plugins.