Code cleanup

-Replace tabs with double-spaces
-Betting spacing and lining up of code functions
-Add missing semi-colons
-Remove extra characters and spaces where applicable
-Remove commented-out code fragments
-Add missing 2021 date to LICENSE
-Small touchups and other misc nitpickings

lib/node.js

@@ -14,15 +14,15 @@ Client.prototype.cmd = function() {
 function callRpc (cmd, args, rpc) {
   var fn = args[args.length - 1];
 
-  // If the last argument is a callback, pop it from the args list
-  if (typeof fn === 'function') {
+  // if the last argument is a callback, pop it from the args list
+  if (typeof fn === 'function')
     args.pop();
-  } else {
+  else
     fn = function () {};
-  }
 
   rpc.call(cmd, args, function () {
     var args = [].slice.call(arguments);
+
     args.unshift(null);
     fn.apply(this, args);
   }, function(err) {