anchor.diff:  The Authentication class offers convenient functions to perform
   authentication. The main methods are
   
  -[source]
  +[source,java]
   ------------------------------------------
   getAuthenticatedUser()
   authenticate(String password, String hash)
  
positive.code: 
  Consider for example the following pojo.
  
  [source]
  ---------------------------------------------------------------
  package models;
  
  
negative.code: lastname from the request is not empty. mangoo I/O offers some convenient
  functions to validate the submitted form values.
  
  [source,java]
  ---------------------------------
  public Response form(Form form) {
      form.email("email");
  