Revert "Disable new relic"

This reverts commit 6412a07ad1becb984e767022edf558fe4d7f4d8d.
Switch to unicorn
Revert "Revert "Disable new relic""

This reverts commit 0c3e12dfa3b3b403acf0d87d7220e451dbca2a1e.
Try preload_app for unicorn