Add ember-cli-code-coverage.

.gitignore

@@ -13,6 +13,7 @@
 /.sass-cache
 /connect.lock
 /coverage/*
+/coverage_*
 /local_uploads
 /libpeerconnection.log
 npm-debug.log

.nycrc

@@ -0,0 +1,3 @@
+{
+    "temp-directory": "coverage"
+}

config/coverage.js

@@ -0,0 +1,4 @@
+module.exports = {
+    parallel: true,
+    reporters: ['json', 'lcov'],
+};

mirage/config.js

@@ -1,6 +1,9 @@
 import Response from 'ember-cli-mirage/response';
 
 export default function() {
+    // Used by ember-cli-code-coverage
+    this.passthrough('/write-coverage');
+
     this.namespace = '/api/v1';
 
     this.get('/summary', function(schema) {