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Fix for #348 - IGListStackedSectionController's children need to know numberOrItems before didUpdate is called

Summary:
The reloadData method in IGListStackedSectionController was being called too soon.  It was moved from the constructor to the `didUpdateToObject` method.  Tests were updated to reflect the change.

- [x] All tests pass. Demo project builds and runs.
- [x] I added tests, an experiment, or detailed why my change isn't tested.
- [ ] I added an entry to the `CHANGELOG.md` for any breaking changes, enhancements, or bug fixes.
- [x] I have reviewed the [contributing guide](https://github.com/Instagram/IGListKit/blob/master/.github/CONTRIBUTING.md)
Closes https://github.com/Instagram/IGListKit/pull/390

Differential Revision: D4419751

Pulled By: rnystrom

fbshipit-source-id: 7c812d306

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