make userlike button work with sign in and out

app/app.coffee

@@ -54,17 +54,20 @@ App = Ember.Application.extend(Ember.Evented,
 
     @on 'user:refreshed', (user) ->
       Travis.onUserUpdate(user)
-      Travis.setupUserlike(user)
 
     @on 'user:synced', (user) ->
       Travis.onUserUpdate(user)
 
+    @on 'user:signed_out', () ->
+      Travis.removeUserlike()
+
   currentDate: ->
     new Date()
 
   onUserUpdate: (user) ->
     if config.pro
       @identifyCustomer(user)
+      @setupUserlike(user)
 
     @subscribePusher(user)
 
@@ -83,7 +86,7 @@ App = Ember.Application.extend(Ember.Evented,
   setupUserlike: (user) ->
 
     btn = document.getElementById('userlikeCustomTab')
-    btn.className = btn.className + " logged-in"
+    btn.classList.add("logged-in")
 
     userlikeData = window.userlikeData = {}
     userlikeData.user = {}
@@ -91,12 +94,15 @@ App = Ember.Application.extend(Ember.Evented,
     userlikeData.user.name= user.login;
     userlikeData.user.email = user.email;
 
-    s = document.createElement('script')
-    s.src = '//userlike-cdn-widgets.s3-eu-west-1.amazonaws.com/0327dbb23382ccbbb91b445b76e8a91d4b37d90ef9f2faf84e11177847ff7bb9.js'
-    document.body.appendChild(s)
+    unless document.getElementById('userlike-script')
+      s = document.createElement('script')
+      s.id = 'userlike-script'
+      s.src = '//userlike-cdn-widgets.s3-eu-west-1.amazonaws.com/0327dbb23382ccbbb91b445b76e8a91d4b37d90ef9f2faf84e11177847ff7bb9.js'
+      document.body.appendChild(s)
 
-  # displayCharm: ->
-  #   __CHARM.show()
+  removeUserlike: () ->
+    btn = document.getElementById('userlikeCustomTab')
+    btn.classList.remove("logged-in")
 
   identifyCustomer: (user) ->
     if _cio && _cio.identify

app/utils/auth.coffee

@@ -25,6 +25,7 @@ Auth = Ember.Object.extend
       @store.unloadAll('user')
     @set('currentUser', null)
     @sendToApp('afterSignOut')
+    Travis.trigger('user:signed_out')
 
   signIn: (data) ->
     if data