Extension point schemas not provided in org.maven.ide.eclipse plugin

org.maven.ide.eclipse provides a number of extension points for consumers to use. The extension points schemas, describing the syntax of the XML extension point descriptions, are not packaged with the plugin. The upshot is that the PDE tools can't guide you when creating an extension - you need to go find the schemas yourself, or rebuild the org.maven.ide.eclipse plugin.

Trivial patch attached that will (using PDE build at least) ensure that the schemas/ directory gets included in the binary build.