Merge pull request #1488 from cpennington/update-newrelic

Upgrade newrelic so that we can use the new histogram and percentile features

requirements/edx/base.txt

@@ -78,7 +78,7 @@ watchdog==0.6.0
 
 # Metrics gathering and monitoring
 dogapi==1.2.1
-newrelic==1.13.1.31
+newrelic==2.4.0.4
 
 # Used for documentation gathering
 sphinx==1.1.3