Remove check_token_auth filter

Because of the way ExtractPaths works, `params[:format]` wouldn't
necessarily be available at the time this filter was running, and so it
would erroneously redirect to `new_user_session_path`

app/controllers/application_controller.rb

@@ -2,7 +2,6 @@ class ApplicationController < ActionController::Base
   before_filter :authenticate_user!
   before_filter :reject_blocked!
   before_filter :set_current_user_for_mailer
-  before_filter :check_token_auth
   before_filter :set_current_user_for_observers
   before_filter :dev_tools if Rails.env == 'development'
 
@@ -26,13 +25,6 @@ class ApplicationController < ActionController::Base
 
   protected
 
-  def check_token_auth
-    # Redirect to login page if not atom feed
-    if params[:private_token].present? && params[:format] != 'atom'
-      redirect_to new_user_session_path
-    end
-  end
-
   def reject_blocked!
     if current_user && current_user.blocked
       sign_out current_user