Fixes for pooling Unity UI, and automatic pool creation.#4

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brettmjohnson wants to merge 4 commits intoUnityPatterns:masterfrom brettmjohnson:master

Commits on Jun 18, 2016

Support for RectTransform
brettmjohnson
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Spawn now creates a pool if one is not found. As a result, CreatePool isn't required for initial setup. And the fallback to normal instantiation is no longer needed and has been removed.

Brett Johnson
authored and
Brett Johnson
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SetParent used to fix UI spawning issues.

Brett Johnson
authored and
Brett Johnson
committed
Simplified SetParent setup

Brett Johnson
authored and
Brett Johnson
committed