docs: function Config( defaults, extend, envName )
  {
    // Constants
    // -------------
  
    // test instance uniqueness
    this._UID         = _.uniqueId('config_')
  
    this._DEFAULTENV  = 'default'
  
  
    // CORE's settings
    // ------------------------
  
    // default app configuration
    var confDefault = this.getConfigParam( defaults )
      , confExtend  = ( !_.isUndefined( extend ) )
                      ? this.getConfigParam( extend )
                      : {}
  
    this._ENV    = envName || this._DEFAULTENV
    this._CONFIG = _.merge(
          {}
        , confDefault
        , confExtend
      )
  
    return this
  }