drop support for 0.12 (#2171)

* all: drop support for 0.12 [ci skip]
* scripts: add more modules to blacklist for now
* update common deps for service modules

Author: stephenplusplus

packages/google-cloud-language/package.json

@@ -52,7 +52,7 @@
     "language"
   ],
   "dependencies": {
-    "@google-cloud/common": "^0.12.0",
+    "@google-cloud/common": "^0.13.0",
     "extend": "^3.0.0",
     "google-gax": "^0.12.0",
     "google-proto-files": "^0.10.0",
@@ -73,6 +73,6 @@
   },
   "license": "Apache-2.0",
   "engines": {
-    "node": ">=0.12.0"
+    "node": ">=4.0.0"
   }
 }