Refactoring the code for pub sub (#155)

- We were using the attribute name 'channel' to store pubsub tokens, which was confusing.
- switched to faker from ffaker
- spec for contact.rb

app/javascript/dashboard/api/auth.js

@@ -108,9 +108,9 @@ export default {
     }
     return false;
   },
-  getChannel() {
+  getPubSubToken() {
     if (this.isLoggedIn()) {
-      return Cookies.getJSON('user').channel;
+      return Cookies.getJSON('user').pubsub_token;
     }
     return null;
   },