Comment out unsetting of JAVA_OPTS

***IMPORTANT*** Make sure to enable "buildpack-env-arg" labs feature and disable "user-env-compile"

New buildpack-env-arg labs feature will be replacing user-env-compile.  As a result we need to be allowed to pass in JAVA_OPTS for heroku to compile.

    JAVA_OPTS=-Xms512m -Xmx512m -Xss512k -XX:+UseCompressedOops -javaagent:lib/newrelic/newrelic.jar