Increase version to v1.4.0 in preparation for release (#1230)

bower.json

 {
   "name": "kubernetes-dashboard",
-  "version": "1.4.0-beta2",
+  "version": "1.4.0",
   "dependencies": {
     "angular": "~1.5.7",
     "angular-animate": "~1.5.7",

build/conf.js

@@ -49,7 +49,7 @@ const version = {
   /**
    * Current release version of the project.
    */
-  release: 'v1.4.0-beta2',
+  release: 'v1.4.0',
   /**
    * Version name of the canary release of the project.
    */

package.json

 {
   "//": "Specification of this file can be found at: https://docs.npmjs.com/files/package.json",
   "name": "kubernetes-dashboard",
-  "version": "1.4.0-beta2",
+  "version": "1.4.0",
   "repository": {
     "type": "git",
     "url": "https://github.com/kubernetes/dashboard.git"

src/deploy/kubernetes-dashboard.yaml

@@ -35,7 +35,7 @@ spec:
     spec:
       containers:
       - name: kubernetes-dashboard
-        image: gcr.io/google_containers/kubernetes-dashboard-amd64:v1.4.0-beta2
+        image: gcr.io/google_containers/kubernetes-dashboard-amd64:v1.4.0
         imagePullPolicy: Always
         ports:
         - containerPort: 9090