anchor.diff:  Session authentication backend, is the simplest backend of all implemented backends
   on _buddy_ but it requires of other additional middlewares from ring: cookies and/or session.
   
  -Unlike the previous auth backend, this does not requires authfn, because it relies on 
  +Unlike the previous auth backend, this does not requires authfn, because it relies on
   `:identity` key on session  and trust it. If a session contains the `:identity` key with
   logical true value it identifies the current request as authenticated and put `:identity`
   key on request map.
  
positive.code: 
  All contributions to _buddy_ should keep these important rules in mind.
  
  Project Maturity
  ----------------
  
  _buddy_ is a young project and can experiment some api changes.
  
  Install
  -------
  
  This section covers a installation of _buddy_.
  
  Leiningen
  ~~~~~~~~~
  
  
negative.code: ----
  
  Signing process consists on concat signature on the end of the original string,
  separating the signature with predefined separator (default ":" char). Signature
  consists on timestamped hmac signature. *Timestamp* can be used for invalidate by
  time some signed data.
  
  .Invalidate signed data using timestamp
  