FEATURE: upgrade message_bus

New version has support for chunked encoding, this cuts down
significantly on network usage when lots of messages are sent

We no longer have to re-establish a connection after we get a message,
 we simply reuse.

Gemfile

@@ -50,7 +50,7 @@ gem 'ember-source', '1.12.1'
 gem 'barber'
 gem 'babel-transpiler'
 
-gem 'message_bus'
+gem 'message_bus', '2.0.0.beta.1'
 
 gem 'rails_multisite'
 

Gemfile.lock

@@ -156,7 +156,7 @@ GEM
     mail (2.6.3)
       mime-types (>= 1.16, < 3)
     memory_profiler (0.9.4)
-    message_bus (1.1.1)
+    message_bus (2.0.0.beta.1)
       rack (>= 1.1.3)
       redis
     metaclass (0.0.4)
@@ -433,7 +433,7 @@ DEPENDENCIES
   lru_redux
   mail
   memory_profiler
-  message_bus
+  message_bus (= 2.0.0.beta.1)
   mime-types
   minitest
   mocha