use fast implementations of tweetnacl serverside

scripts/tests/test-rpc.js

@@ -3,7 +3,7 @@
 var Client = require("../../lib/client/");
 var Crypto = require("../../www/bower_components/chainpad-crypto");
 var Mailbox = Crypto.Mailbox;
-var Nacl = require("tweetnacl");
+var Nacl = require("tweetnacl/nacl-fast");
 var nThen = require("nthen");
 var Pinpad = require("../../www/common/pinpad");
 var Rpc = require("../../www/common/rpc");