Update Tile to use new Pivotal tile-generator with `app-broker` type

[spiegela]

The latest Pivotal tile generator has support for additional deployment types, including a Cloud Foundry hosted app service-broker.

This support will greatly simplify the broker tile, as the custom BOSH jobs which deploy, register and delete the broker can (potentially) be eliminated.

In order to accomplish this, however, the process of deploying the broker will need to be simplified. Currently, the BOSH release generates an application.yml file and certificate.pem file, and recomplies the JAR file of the app with these additions. This process is too customized to be supported by the new Tile generator method.

Alternatively, the broker can make use of environment variables to configure the certificate, broker configuration and environment variables.