Transition coordinator

[wmcginty]

There's a lot going on here. Basically it allows you to use UIViewControllerInteractiveTransitioning and UIViewControllerTransitionCoordinator objects with the container.

I'm also thinking we might want to split this into it's own Pod as it's getting so large.

I'm still making tweaks to the protocols, but I wanted to get other eyes on it for more improvements.

[codecov-io]

Codecov Report

Merging #63 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #63   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           4      4           
  Lines         413    413           
=====================================
  Hits          413    413

Impacted Files	Coverage Δ
Tests/ActiveLabelTests.swift	100% <ø> (ø)	:arrow_up:
Tests/ContainerTests.swift	100% <ø> (ø)	:arrow_up:

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[tylermilner]

@ganttastic Agreed! I'm hoping that in the near future (possibly if we split this off into its own library), we provide several examples on how to use it. Everything from the most basic parent/child relationship to complex containers that animate between their children.

[wmcginty]

OK, changelog entry added and fixed some of the duplicate code issues and grammar mistakes @earlgaspard found. Let me know if there's anything else.

[wmcginty]

Going to give @earlgaspard and @ganttastic a chance to take another look after the last round of tweaks, otherwise I'll look to merge in later today / tomorrow.