Update dependencies + fix a few tests (#448)

* Add semistandard as a devDependency

* Fix storage tests

* Fix language tests

* Update (some) dependencies

* Fix language slackbot tests

Author: Ace Nassri

packages/google-cloud-node/samples/package.json

@@ -24,7 +24,7 @@
     "yargs": "8.0.2"
   },
   "devDependencies": {
-    "@google-cloud/nodejs-repo-tools": "1.4.15",
+    "@google-cloud/nodejs-repo-tools": "1.4.16",
     "ava": "0.21.0",
     "proxyquire": "1.8.0",
     "sinon": "3.0.0"