add data to UnauthorizedError so that more information can be returned to client

lib/UnauthorizedError.js

@@ -1,8 +1,12 @@
 function UnauthorizedError (code, error) {
   Error.call(this, error.message);
   this.message = error.message;
-  this.code = code;
   this.inner = error;
+  this.data = {
+    message: this.message,
+    code: code,
+    type: "UnauthorizedError"
+  };
 }
 
 UnauthorizedError.prototype = Object.create(Error.prototype);

test/authorizer.test.js

@@ -16,7 +16,8 @@ describe('authorizer', function () {
       });
 
       socket.on('error', function(err){
-        err.should.eql("Invalid token: no header in signature 'boooooo'");
+        err.message.should.eql("Invalid token: no header in signature 'boooooo'");
+        err.code.should.eql("invalid_token");
         done();
       });
     });