New Relic set up

[sbrudz]

Configure New Relic APM.

The New Relic license key and app name should live in environment variables.

Here's the outline of an approach:

Install the newrelic node.js npm package.

Create newrelic-loader.ts

let newrelic: any = {};

if (Object.prototype.hasOwnProperty.call(process.env, "NEWRELIC_LICENSE")) {
    console.log("Enabling New Relic");
	newrelic = require("newrelic"); // tslint:disable-line
}

export default newrelic;

and then in app.ts import the newrelic-loader and use a technique like the one described here https://facebook.github.io/create-react-app/docs/title-and-meta-tags to inject newrelic. getBrowserTimingHeader() into the index.html page