Fixes #48 (#249)

Fixes #234
Fixes #250

Addressed comments.

Author: jmdobry

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

@@ -5,7 +5,7 @@
   "license": "Apache Version 2.0",
   "author": "Google Inc.",
   "scripts": {
-    "test": "cd ..; npm run st -- language/system-test/*"
+    "test": "cd ..; npm run st -- language/system-test/*.test.js"
   },
   "dependencies": {
     "@google-cloud/language": "^0.6.0",