Fix app crashing when applying auto layout on tabbaritems.#35

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doggy wants to merge 3 commits intorobbdimitrov:masterfrom

Commits on Dec 10, 2014

Fix app crashing when applying auto layout on tabbaritems.
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Commits on Dec 11, 2014

some updates for supporting auto-layout animation
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Commits on Apr 11, 2016

Merge commit 'b53d990a11dff65ffc4eb930dc3204f19409ac95'
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