use fast implementations of tweetnacl serverside

storage/tasks.js

@@ -1,7 +1,7 @@
 var Fs = require("fs");
 var Fse = require("fs-extra");
 var Path = require("path");
-var nacl = require("tweetnacl");
+var nacl = require("tweetnacl/nacl-fast");
 var nThen = require("nthen");
 
 var Tasks = module.exports;