removed dockunit.json

Dockunit.json

@@ -1,12 +0,0 @@
-{
-  "containers": [
-    {
-      "prettyName": "Node 7.4.0",
-      "image": "node:7.4.0",
-      "beforeScripts": [
-        "npm install"
-      ],
-      "testCommand": "npm run test"
-    }
-  ]
-}