Revert "Revert "google tracking code""

This reverts commit f70662dcf770ba001e5f8c60c64ffd8123ccf935.
Revert "Revert "Add New Relic plugin""

This reverts commit 5dc9613109deb82bdb0ac5644ca0e23530cd35a0.
Use Web Audio API
Add buffer-loader
Remove tracking codes