Paymo 3.0 Javascript wrapper

paymo.js

//Paymo API
/**
 * This is a quick wrapper for the Paymo 3.0 API
 * Requires (jquery.rest)[https://github.com/jpillora/jquery.rest]
 *
 * Copyright (c) 2014 Yisrael Dov Lebow <lebow@lebowtech.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */


var PaymoAPI = new $.RestClient('https://app.paymoapp.com/api/',{ajax:{headers:{Accept:'application/json'}}});
var resourceNames =[
	'sessions',
	'company',
	'me',
	'clients',
	'clientcontacts',
	'projects',
	'tasklists',
	'tasks',
	'entries',
	'discussions',
	'threads',
	'comments',
	'milestones',
	'users',
	'files',
	'invoices',
	'invoiceitems',
	'invoicepayments',
	'estimates',
	'estimateitems',
	'recurringprofiles',
	'recurringprofileitems',
	'expenses',
	'reports',
	'tags',
	'projecttemplates',
	'projecttemplatestasklists',
	'projecttemplatestasks'
];
for (var i = resourceNames.length - 1; i >= 0; i--) {
	PaymoAPI.add(resourceNames[i]);
};

/**
 * logs in and returns a promise for a new session 
 * clears out username and password 
 */
PaymoAPI.login = function(username,password){
	PaymoAPI.opts.username = username;
	PaymoAPI.opts.password = password;
	var promise = PaymoAPI.sessions.create()
	PaymoAPI.opts.username = null;
	PaymoAPI.opts.password = null;
	return promise;
}

/**
 * sets up your session ID so you don't need to keep using user name and password to login
 */
PaymoAPI.setSession = function(sessionId){
	PaymoAPI.opts.ajax.headers['X-Session'] = sessionId;
}

//so it will work with old version of the wrapper
PaymoAPI.setToken = PaymoAPI.setSession