use custom NEW_RELIC_CONFIG_FILE if present
Implemented newrelic-daemon to be observed via 'heroku logs'
Merge branch 'aheusser-newrelic-support' into newrelic
Removed setting of NEW_RELIC_LOG in the bin/compile

The PHP Agent needs to use stderr so that it doesn't interfere with
other features and configuration on the dyno (and in fact is hard-coded
to do so in ext-newrelic.ini).  So the setting of NEW_RELIC_LOG is harmless,
but not actually needed.
Merge branch 'aheusser-remove-new-relic-log' into newrelic
check if composer exists and prefer composer.phar if possible
disable NR during boot and use the same alias approach in compile
Merge branch 'newrelic' into develop