GET
 This is a webmaster only API that allows you to manage Viadesk member lists
  
 GET projecten.viadesk.com/api/memberlist.json?
     memberlist= 64785-67726f7570 //id of the memberlist, optional
     &user= 30964-75736572 // id of the user, optional, retrieves the memberlists of this user
  
 POST
 Update an existing memberlist
 POST projecten.viadesk.com/api/memberlist.json
 form field “memberlist” // the id of the memberlist (required)
 form field “name” // optional, allows for modification of the name of the memberlist
 form field “user” // the id of the user, allows for adding one or multiple users
  form field “showUpdatedMemberlist” // return the updated memberlist, else we only return status OK, default true
 
 PUT
 Create a new memberlist
 PUT projecten.viadesk.com/api/memberlist.json?
     name=Marketing // required, the name of the newly created memberlist
     form field “showUpdatedMemberlist” // return the updated memberlist, else we only return status OK, default true
  
 DELETE
 Remove memberlist or users from a memberlist
 DELETE projecten.viadesk.com/api/memberlist.json?
     memberlist= 64785-67726f7570 //id of the memberlist, required.
     &user= 30964-75736572 // id of the user, optional. Beware, if not present, the memberlist itself will be deleted! If present, removes one or multiple users from the memberlist.