Add node security check

package.json

@@ -36,6 +36,7 @@
     "nsp": "=2.6.1",
     "postcss-cli": "=2.6.0",
     "sass-lint": "=1.9.1",
+    "snyk": "=1.20.0",
     "uglify-js": "=2.7.3"
   }
 }

scripts/runtests

@@ -2,6 +2,7 @@
 
 set -e
 
+export PATH=node_modules/.bin:${PATH}
 export PATH=env/bin:${PATH}
 export DEBUG=true
 export IN_TEST=true
@@ -15,3 +16,5 @@ npm test
 
 bandit -r project/ manage.py
 safety check
+nsp check
+snyk test