made websocket server host configurable

config/app_config.yml

@@ -7,6 +7,7 @@
 development:
   debug: false
   socket_debug : false
+  socket_host: 0.0.0.0
   socket_port: 8080
   socket_collection_name: 'websocket'
   pubsub_server: 'https://pubsubhubbub.appspot.com/'
@@ -14,11 +15,13 @@ development:
 test:
   debug: false
   socket_debug : false
+  socket_host: 0.0.0.0
   socket_port: 8081
   pubsub_server: 'https://pubsubhubbub.appspot.com/'
 
 production:
   debug: false
   socket_debug : false
+  socket_host: 0.0.0.0
   socket_port: 8080
   pubsub_server: 'https://pubsubhubbub.appspot.com/'

script/websocket_server.rb

@@ -24,7 +24,7 @@ begin
     Diaspora::WebSocket.initialize_channels
 
     EventMachine::WebSocket.start(
-                  :host => "0.0.0.0",
+                  :host => APP_CONFIG[:socket_host],
                   :port => APP_CONFIG[:socket_port],
                   :debug =>APP_CONFIG[:socket_debug]) do |ws|
       ws.onopen {