This module is part of the Apache Sling project.
A public documentation of the library can be found at: http://www.jcrbrowser.org/sling/libs/jsnodetypes/content/documentation.html. The documentation of the library version you deployed is shipped with the bundle. It can be found at http://[yourserver]:[yourport]/libs/jsnodetypes/content/documentation.html
Use 'mvn install -P autoInstallBundle' to install that bundle to your local Sling instance at port 8080.