The AccesorMaker takes in, at use-time, a hash-reference and an 
     extra keyword. It uses the keys of the hash-reference to create 
     accessor-methods in the namespace of the caller. The values that 
     are given to the keys are the default value of the accessor.

     Class::AccessorMaker will create a constructor (called "new()")
     by default.
     This constructor will be able to take that nice and shiny 
     hash-like structure as you can see in the first example.

     If you want your constructor to run your objects "init()" routine
     you can specify the keyword "new_init". If you want to write your
     own "new()" routine you can use  "no_new".