feat: update unban logic/invocation and refactor User.bans module

* auto unban when User.getUsersFields is called and the user is banned but has expired

* cleanups and removal of expiry_readable

* expiry_readable make an alias for backward compatibility

* User.bans.func vs User.*ban*Func

* console.log cleanups, plus todo message added

* use code util.deprecate

* fix: remove ununsed winston require

src/user/digest.js

@@ -79,7 +79,7 @@ Digest.getSubscribers = function (interval, callback) {
 		},
 		function (subscribers, next) {
 			async.filter(subscribers, function (uid, next) {
-				user.isBanned(uid, function (err, banned) {
+				user.bans.isBanned(uid, function (err, banned) {
 					next(err, !banned);
 				});
 			}, next);