Fix for groestl - was missing share multiplier

lib/algoProperties.js

@@ -103,6 +103,7 @@ var algos = module.exports = global.algos = {
         }
     },
     groestl: {
+        multiplier: Math.pow(2, 16),
         hash: function(){
             return function(){
                 return multiHashing.groestl.apply(this, arguments);