cocos2d/cocos2d-x — pull request #6871 by asuuma (2014-05-22 07:11:41+00:00)
Title: Fix Repeat will run one more over in rare situations

When times specified at `Repeat::create` is big, `_nextDt` in `Repeat::update` will may have some error that cause `Repeat` to run one more over than you specified.

Bug can be appeared in below code.
```C++
auto action = Sequence::createWithTwoActions(CallFunc::create([&]() {
// some count up
}),
DelayTime::create(1.0f / 50));
this->runAction(Repeat::create(action, 50));
// count up will be executed 51 times!
```