Support supplementaryViews created from nibs#90

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rawlinxx wants to merge 4 commits intoInstagram:masterfrom rawlinxx:master

+58-5

Commits on Oct 20, 2016

Support supplementaryViews created from nibs
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complete
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Commits on Oct 21, 2016

complete
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Commits on Oct 24, 2016

Merge branch 'master' of https://github.com/Instagram/IGListKit
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