Java 8 Support (rest)

Fork the Java build pack on Github.
https://github.com/cloudfoundry/java-buildpack
Clone your fork of the Java build pack.
Edit config/open_jdk_jre.yml.  Change "version: 1.7.0_+" to "version:
1.8.0_+" and references for "permgen" to "metaspace".
Commit the change and push it back to Github.
Push your application with "-b <url-to-your-fork>" or set "buildpack:
<url-to-your-fork>" in manifest.yml.