This project is not dead. It just happens that I am busy and get a lot of difficult feature requests. The code doesn't magically break just by sitting around - even if the last commit was a month ago, the released version of the plugin probably still works fine! :)
We try to stick to [SemVer](http://semver.org/), but it's rather difficult with a Bukkit plugin so in reality our version numbers are almost meaningless.
Generally, new releases should be built against the latest Spigot/Bukkit at the time the release is published.