Add optional vuex-electron plugin (#692)

* Sync Vuex store between all processes

* Add information about `vuex-electron` to docs

Author: Andrew Emelianenko

Diff for: docs/en/vue_accessories.md

@@ -6,6 +6,7 @@ electron-vue comes packed with the following `vue` plugins that can be installed
 * [vue-electron](https://github.com/SimulatedGREG/vue-electron) \(attach electron APIs to Vue object\)
 * [vue-router](https://github.com/vuejs/vue-router) \(single page application routes\)
 * [vuex](https://github.com/vuejs/vuex) \(flux-inspired application architecture\)
+* [vuex-electron](https://github.com/vue-electron/vuex-electron) \(sync vuex store between all processes and instances\)
 
 ---
 
@@ -33,3 +34,8 @@ The provided project structure should feel familiar to the setup provided in the
 
 The provided project structure is rather bare but does encourage the use of `vuex`'s module pattern to help organize your data stores. The extra `@/store/modules/index.js` let's your `vuex` store import all modules in a one-shot manner.
 
+### [`vuex-electron`](https://github.com/vue-electron/vuex-electron)
+
+> The easiest way to use your Vuex store between all processes (including main) and instances.
+
+In case if your application has multiple windows, probably you would need to share the state of the application between them. Moreover, probably you would need to share the state of the app between launches or different instances. You could easily solve these two tasks by using `vuex-store`.

Diff for: meta.js

@@ -79,8 +79,8 @@ module.exports = {
     plugins: {
       type: 'checkbox',
       message: 'Select which Vue plugins to install',
-      choices: ['axios', 'vue-electron', 'vue-router', 'vuex'],
-      default: ['axios', 'vue-electron', 'vue-router', 'vuex']
+      choices: ['axios', 'vue-electron', 'vue-router', 'vuex', 'vuex-electron'],
+      default: ['axios', 'vue-electron', 'vue-router', 'vuex', 'vuex-electron']
     },
     eslint: {
       type: 'confirm',
@@ -148,7 +148,8 @@ module.exports = {
         'axios': '^0.18.0',
         'vue-electron': '^1.0.6',
         'vue-router': '^3.0.1',
-        'vuex': '^3.0.1'
+        'vuex': '^3.0.1',
+        'vuex-electron': '^1.0.0'
       }
 
       if (Object.keys(plugins).length > 0) output += ',\n'

Diff for: template/src/renderer/store/index.js

@@ -1,11 +1,21 @@
 import Vue from 'vue'
 import Vuex from 'vuex'
 
+{{#isEnabled plugins 'vuex-electron'}}
+import { createPersistedState, createSharedMutations } from 'vuex-electron'
+
+{{/isEnabled}}
 import modules from './modules'
 
 Vue.use(Vuex)
 
 export default new Vuex.Store({
   modules,
+  {{#isEnabled plugins 'vuex-electron'}}
+  plugins: [
+    createPersistedState(),
+    createSharedMutations()
+  ],
+  {{/isEnabled}}
   strict: process.env.NODE_ENV !== 'production'
 })