Layout giudes on iOS 9

[dlahyani]

On iOS 7 (if I am not mistaken) Apple introduced two new properties to UIViewController: topLayoutGuide and bottomLayoutGuide. These properties can be passed as is to auto layout as constraint items. In iOS 7 and 8 these are actually UIView objects that implements the UILayoutSupport protocol and as UIViews they fit well as layout items for Masonry.
However on iOS 9 these layout guides are of kind UILayoutGuide which is not a subclass of UIView, this causes [MASViewConstraint setSecondViewAttribute:] raise an assertion exception when the second attribute is a layout guide.

[cloudkite]

@dlahyani Yes happy to accept PRs which have the same API as recently added SnapKit layout guide support see SnapKit/SnapKit@6252444

[dlahyani]

👍 thanks.