Add support for more DEBUG output
Rename add_field() to just field()
Relationships are now objects

  - Rename add_relationship() to relationship()
  - Rename Relationship::X::create() to X::monkey_patch()
Related documents are stored using a dbref
Rename Document::_raw to ::data
Add test for initialize()
Released version 0.07

       * Rename Model::add_field() to just field()
       * Rename Document::_raw() to ::data()
       * Relationships are now objects
       * Change related documents are stored using a dbref
fixed failing test