Returing that we had an error in shapeshift. Whoops!

lib/payments.js

@@ -128,7 +128,7 @@ let shapeshiftQueue = async.queue(function (task, callback) {
     ], function (err, result) {
         if (err) {
             console.error("Error processing shapeshift txn: " + JSON.stringify(err));
-            callback();
+            callback(true);
         } else {
             // Need to fill out this data pronto!
             console.log("Processed ShapeShift transaction for: " + address + " Paid out: " + result + " payments in the db");