New versions of this project are released every so often.
Current version (Stable)
1.6.X is a new feature release. See the linked release notes for the new features introduced in this release.
If you need certain bleeding-edge features not implemented in the latest stable release, you can build off master. But be warned - trunk may break at any time!
Here you can find previous versions of the documentation.
You can find past versions of this project on GitHub.