Move chat to own module.

src/components/chat/chat.js

@@ -1,23 +1,18 @@
 const chat = {
   data () {
     return {
-      messages: [],
       currentMessage: '',
-      socket: this.$store.state.users.socket,
       channel: null
     }
   },
-  created () {
-    this.channel = this.socket.channel('chat:public')
-    this.channel.on('new_msg', (msg) => {
-      this.messages.push(msg)
-      this.messages = this.messages.slice(-19, 20)
-    })
-    this.channel.join()
+  computed: {
+    messages () {
+      return this.$store.state.chat.messages
+    }
   },
   methods: {
     submit(message) {
-      this.channel.push('new_msg', {text: message}, 10000)
+      this.$store.state.chat.channel.push('new_msg', {text: message}, 10000)
       this.currentMessage = '';
     }
   }