Instagram / IGListKit / 2383

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Pull #1377

travis-ci

Split IGListKit and IGListDiffKit (#1377)

Summary:
Pull Request resolved: https://github.com/Instagram/IGListKit/pull/1377

This splits the diffing-only components from `IGListKit` out into a separate library, `IGListDiffKit`, allowing them to be used independently of the rest of `IGListKit`. We've found that the diffing components of the library are useful independently of the rest of the `UICollectionView` infrastructure, and separating the libraries allows apps to take advantage of those components without paying the full binary size cost of `IGListKit`. The diffing components are available as a subspec in Cocoapods, and as an independent framework in Carthage and direct Xcode project import (i.e. Git submodules).

This is a breaking change, necessitating a major version bump, although it should have only minor impact for projects using the umbrella header `IGListKit.h`, as that header continues to import the diffing utilities. In particular, for a project using Cocoapods and importing `IGListKit.h`, there should be no code changes required.

Differential Revision: D18114249

fbshipit-source-id: bf8e7c960

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