Adds Nullability#399

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fabb wants to merge 2 commits intoSnapKit:masterfrom

fabb:nullability

Commits on Oct 6, 2017

use instancetype instead of id

Patrick Pöchhacker
authored and
fabb
committed
added nullability - made everything nullable, except for weak properties which cannot be nullable and other parameters that are explicitly allowed to be nil from the context
fabb
committed