Added Objective-C port of ASAttributedLabelNode#3

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pkclsoft:ObjectiveCSupport

Commits on Nov 28, 2016

Added Objective-C port of ASAttributedLabelNode
pkclsoft
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Commits on Dec 8, 2016

The calculation of the number of bytes per row didn’t work properly on older devices (e.g. iPad2). Changed to allow CGBitmapContextCreate to calculate it properly internally.
pkclsoft
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