[TEST] Add chai and sinon for testing.

Begin testing remote.js
    Add initialization of 'note variable' and a comment that it should be removed

src/js/ripple/remote.js

@@ -1393,6 +1393,8 @@ Remote.prototype.request_unl_add = function (addr, comment, callback) {
   request.message.node = addr;
 
   if (comment) {
+    // note is not specified anywhere, should remove?
+    var note = undefined; 
     request.message.comment = note;
   }