ADD: create update complete comments

lib/comment.js

@@ -29,6 +29,9 @@ var comment = function(client, xml) {
 		utils.parse_xml(this, xml.comment || xml);
 	}
 };
+comment.prototype.create = function(item, callback) {
+	this.client.create_item('/comments.xml', utils.to_xml(item, 'comment'), callback, comment);
+};
 comment.prototype.delete = function(callback) {
 	var url = '/comments/' + this.id + '.xml';
 
@@ -39,5 +42,12 @@ comment.prototype.delete = function(callback) {
 comment.prototype.get = function(id, callback) {
 	this.client.get_item('/comments/' + id + '.xml', callback, comment);
 };
+comment.prototype.to_xml = function(excluded_keys) {
+	return utils.to_xml(this, 'comment', excluded_keys);
+};
+comment.prototype.update = function(callback) {
+	var path = '/comments/' + this.id + '.xml';
+	this.client.send('PUT', path, this.to_xml(), callback);
+};
 
 module.exports = comment;