Fix viewing repo after viewing all repos on safari

When transitioning from recent route to a specific repo deactivate is
not called for some reason on Safari. It seems like a bug in Ember.js,
but I need to investigate more.

A solution is to also try to remove observer in reset controller

app/routes/main-tab.coffee

@@ -17,6 +17,9 @@ Route = TravisRoute.extend
   deactivate: ->
     @controllerFor('repos').removeObserver('firstObject', this, 'currentRepoDidChange')
 
+  resetController: ->
+    @controllerFor('repos').removeObserver('firstObject', this, 'currentRepoDidChange')
+
   currentRepoDidChange: ->
     if repo = @controllerFor('repos').get('firstObject')
       @controllerFor('repo').set('repo', repo)