Java Buildpack v2.5

This change updates the Java Buildpack to version 2.5.  Version 2.5 has the following highlights:

* Improved Access Logging (via Guillaume Berche and and Kevin Kessler)
* Improved AppDynamics Integration (via Troy Astle, Max Brunsfeld, Mike Youngstrom, and Shaozhen Ding)
* New Relic on Java 8
* Secure Dependency Retrieval via HTTPS
* Java 8 as Default
* Tomcat 8 as Default (via Dave Head-Rapson)

Both the online and offline buildpacks are updated as part of this change.