Fire the individual original callbacks when using transactions

Fixes redis#1089

changelog.md

@@ -1,6 +1,12 @@
 Changelog
 =========
 
+## v.2.6.2 - 16 Jun, 2016
+
+Bugfixes
+
+-  Fixed individual callbacks of a transaction not being called (2.6.0 regression)
+
 ## v.2.6.1 - 02 Jun, 2016
 
 Bugfixes

lib/multi.js

@@ -36,6 +36,7 @@ function pipeline_transaction_command (self, command_obj, index) {
         // Keep track of who wants buffer responses:
         // By the time the callback is called the command_obj got the buffer_args attribute attached
         self.wants_buffers[index] = command_obj.buffer_args;
+        command_obj.callback = tmp;
     };
     self._client.internal_send_command(command_obj);
 }

test/multi.spec.js

@@ -393,6 +393,7 @@ describe("The 'multi' method", function () {
                     var arr2 = ['some manner of key', 'otherTypes'];
                     var arr3 = [5768, 'multibarx', 'multifoox'];
                     var arr4 = ['mset', [578, 'multibar'], helper.isString('OK')];
+                    var called = false;
                     client.multi([
                         arr4,
                         [['mset', 'multifoo2', 'multibar2', 'multifoo3', 'multibar3'], helper.isString('OK')],
@@ -411,8 +412,10 @@ describe("The 'multi' method", function () {
                     .mget('multifoo2', ['multifoo3', 'multifoo'], function (err, res) {
                         assert(res[0], 'multifoo3');
                         assert(res[1], 'multifoo');
+                        called = true;
                     })
                     .exec(function (err, replies) {
+                        assert(called);
                         assert.equal(arr.length, 3);
                         assert.equal(arr2.length, 2);
                         assert.equal(arr3.length, 3);