Add HTML encoder lib.

services/web/package.json

@@ -41,6 +41,7 @@
     "mongojs": "2.4.0",
     "mongoose": "4.11.4",
     "multer": "^0.1.8",
+    "node-html-encoder": "0.0.2",
     "nodemailer": "2.1.0",
     "nodemailer-sendgrid-transport": "^0.2.0",
     "nodemailer-ses-transport": "^1.3.0",