replacing welcome message with join room

client/lib/RoomHistoryManager.coffee

 @RoomHistoryManager = new class
-	defaultLimit = 20
+	defaultLimit = 50
 
 	histories = {}
 

server/methods/setUsername.coffee

@@ -41,8 +41,8 @@ Meteor.methods
 				ChatMessage.insert
 					rid: '57om6EQCcFami9wuT'
 					ts: new Date()
-					t: 'wm'
-					msg: username
+					t: 'uj'
+					msg: ''
 					u:
 						_id: user._id
 						username: username