Returns a list of customers. The list can be filtered by customer name.<br/><br/> A note about contact items on each person:<br> <ul> <li>The contact items are an array of objects. Each object has a contactType and a contactValue. <li>The contactType can be one of the following: email, phone, mobile, or fax. <li>The contactValue can be an email address or phone number. </ul>