Add Snyk (security-vulnerability checker)

package.json

@@ -58,6 +58,7 @@
     "requirejs": "2.3.2",
     "requirejs-undertemplate": "~0.0.4",
     "strophe.js": "1.2.10",
+    "snyk": "^1.21.2",
     "strophejs-plugins": "0.0.7",
     "text": "requirejs/text#2.0.15",
     "underscore": "~1.8.3"