fix error on end of each request at cleanup_application

declaring self.method caused rails to error

Signed-off-by: Reinier Balt <lrbalt@gmail.com>

app/models/user.rb

@@ -227,15 +227,15 @@ class User < ActiveRecord::Base
 
 protected
 
-  def self.salted(s)
+  def salted(s)
     "#{Tracks::Config.salt}--#{s}--"
   end
 
-  def self.sha1(s)
+  def sha1(s)
     Digest::SHA1.hexdigest salted s
   end
 
-  def self.hash(s)
+  def hash(s)
     BCrypt::Password.create s
   end