code: function() {
              var jcard = {};
              for(var k in VCard.allKeys) {
                  var key = VCard.allKeys[k];
                  if(this[key]) {
                      jcard[key] = this[key];
                  }
              }
              return jcard;
          }
docs: Copies all properties (i.e. all specified in VCard.allKeys) to a new object and returns it. Useful to serialize to JSON afterwards.