Remove support for user delete

Author: pdziewa

README.md

@@ -156,7 +156,6 @@ Wszystkie odwołania do API zwracają obiekt `Promise` zgodny ze standardem [Pro
   * check
 * user
   * add
-  * delete
   * update
   * get
   * list

lib/user-delete.js

@@ -1,6 +1,5 @@
 var ActionFactoryAbstract = require('./action-factory-abstract');
 var UserAdd = require('./user-add');
-var UserDelete = require('./user-delete');
 var UserUpdate = require('./user-update');
 var UserGet = require('./user-get');
 var UserList = require('./user-list');
@@ -25,15 +24,6 @@ User.prototype.add = function () {
     return this.createAction(UserAdd);
 };
 
-/**
- * delete existing subuser
- * @param  {String} name
- * @return {UserDelete}
- */
-User.prototype.delete = function (name) {
-    return this.createAction(UserDelete, name);
-};
-
 /**
  * update existing subuser
  * @param  {String} name