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Summary:
Issue fixed: #752

- [x] All tests pass. Demo project builds and runs.
- [x] I added tests, an experiment, or detailed why my change isn&amp;amp;amp;amp;#39;t tested.
- [x] 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)

This PR generalizes the layout logic in `IGListCollectionViewLayout.mm` to handle horizontally scrolling layouts, mainly by generalizing references to `width`, `height`, `x` and `y` to take scrolling direction into account. This changes the signature of `IGListCollectionViewLayout.init` as well as the names of a few properties, so it would be a breaking change.

I added a couple of unit tests specifically for horizontal layouts -- but held off from adding a horizontal version of *every* unit test for this class, as it would basically double the number of tests. But if you want that, just let me know and I&amp;amp;amp;amp;#39;m happy to do it.

Also let me know if you want me to add a demo VC to the Examples project that uses this new horizontal flow layout -- I have some demo code handy (I used it for testing), but didn&amp;amp;amp;amp;#39;t want to clutter up the PR if you didn&amp;amp;amp;amp;#39;t want/need it.
Closes https://github.com/Instagram/IGListKit/pull/857

Reviewed By: ryanolsonk

Differential Revision: D5547266

Pulled By: rnystrom

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Source Files on job 1697.11 (DESTINATION="OS=10.2,name=iPad Air 2" SDK="$IOS_SDK" SCHEME="$IOS_SCHEME" RUN_TESTS="YES" BUILD_EXAMPLE="NO" RUN_UI_TESTS="NO" POD_LINT="NO", Gemfile)