Java Buildpack v2.2

This change updates the Java Buildpack to version `2.2`.  Version `2.2` has the following highlights:

* Credentials in repository URIs (via Shaozhen Ding)
* Groovy 2.3 support
* Auto-reconfiguration support for Servlet 3 and distZip style applications
* Buildpack packaging on Windows (via kjhawar)

Both the online and offline buildpacks are updated as part of this change.