Improve Documentation
Improve Documentation

This change updates the documentation of Oracle JRE to describe how to use it
without a buildpack fork.

[resolves #383]

dsyer/java-buildpack,svenfrauen/java-buildpack,dsyer/java-buildpack,gyantcs/kieserver_mvn,ariel-bentu/java-buildpack,hmlingesh/java-buildpack,afalak/java-buildpack,lucasreginato/custom-java-buildpack,afalak/java-buildpack,Appdynamics/java-buildpack,hmlingesh/java-buildpack,cloudfoundry/java-buildpack,hmlingesh/java-buildpack,Service-Flow/java-buildpack-cloudfoundry,stipx/java-buildpack,lucasreginato/custom-java-buildpack,pivotal-cf/weblogic-buildpack,tom-collings/jboss-buildpack,demo-app/java-buildpack,cloudfoundry-community/tomee-buildpack,cloudfoundry/java-buildpack,waltersve/java-buildpack,kishoretiwary/kieserver_mvn_prod,violetagg/java-buildpack,martinSaad/cfJavaBuildPack_newRelic,stipx/java-buildpack,hmlingesh/java-buildpack,santoshsrivastava/kieserver_mvn,pivotal-cf/weblogic-buildpack,violetagg/tomee-buildpack,kishoretiwary/kieserver_mvn_prod,PatrikSteuer/java-buildpack,svenfrauen/java-buildpack,santoshsrivastava/kieserver_mvn,Service-Flow/java-buildpack-cloudfoundry,pivotal-cf/weblogic-buildpack,cloudfoundry-community/jboss-buildpack,violetagg/java-buildpack,PatrikSteuer/java-buildpack,waltersve/java-buildpack,cloudfoundry-community/tomee-buildpack,martinSaad/cfJavaBuildPack_newRelic,demo-app/java-buildpack,pivotal-cf/weblogic-buildpack,Appdynamics/java-buildpack,gyantcs/kieserver_mvn,cloudfoundry-community/jboss-buildpack,ariel-bentu/java-buildpack,violetagg/tomee-buildpack,rakutentech/java-buildpack,tom-collings/jboss-buildpack,rakutentech/java-buildpack