fix: package.json & .snyk to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/npm:ms:20170412


The following vulnerabilities are fixed with a Snyk patch:
- https://snyk.io/vuln/npm:ms:20170412

Latest report for meanjs/mean:
https://snyk.io/test/github/meanjs/mean

.snyk

@@ -0,0 +1,12 @@
+# Snyk (https://snyk.io) policy file, patches or ignores known vulnerabilities.
+version: v1.7.1
+ignore: {}
+# patches apply the minimum changes required to fix a vulnerability
+patch:
+  'npm:ms:20170412':
+    - compression > debug > ms:
+        patched: '2017-06-14T10:21:56.484Z'
+    - mocha > debug > ms:
+        patched: '2017-06-14T10:21:56.484Z'
+    - socket.io > socket.io-adapter > debug > ms:
+        patched: '2017-06-14T10:21:56.484Z'

package.json

@@ -31,7 +31,9 @@
     "test:e2e": "gulp test:e2e",
     "test:coverage": "gulp test:coverage",
     "postinstall": "npm run bower",
-    "generate-ssl-certs": "scripts/generate-ssl-certs.sh"
+    "generate-ssl-certs": "scripts/generate-ssl-certs.sh",
+    "snyk-protect": "snyk protect",
+    "prepublish": "npm run snyk-protect"
   },
   "dependencies": {
     "acl": "~0.4.10",
@@ -49,7 +51,7 @@
     "express-session": "~1.15.2",
     "generate-password": "~1.3.0",
     "glob": "~7.1.1",
-    "helmet": "~2.3.0",
+    "helmet": "~3.6.1",
     "jasmine-core": "~2.5.2",
     "lodash": "~4.17.4",
     "lusca": "~1.4.1",
@@ -72,7 +74,8 @@
     "socket.io": "^2.0.2",
     "validator": "~7.0.0",
     "winston": "^2.3.1",
-    "wiredep": "~4.0.0"
+    "wiredep": "~4.0.0",
+    "snyk": "^1.34.3"
   },
   "devDependencies": {
     "coveralls": "~2.13.0",
@@ -115,5 +118,6 @@
     "semver": "~5.3.0",
     "should": "~11.2.1",
     "supertest": "~2.0.0"
-  }
+  },
+  "snyk": true
 }