[Examples] ASDKgram: Improve style and formatting of primary LayoutSpec implementation.
[Examples] ASDKgram: Improve style and formatting of primary LayoutSpec implementation.

This edits only the flat layout style.  The visually structured version is still the default.

JetZou/AsyncDisplayKit,romyilano/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,romyilano/AsyncDisplayKit,JetZou/AsyncDisplayKit,rmls/AsyncDisplayKit,harryworld/AsyncDisplayKit,rmls/AsyncDisplayKit,lappp9/AsyncDisplayKit,JetZou/AsyncDisplayKit,lappp9/AsyncDisplayKit,harryworld/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,JetZou/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,maicki/AsyncDisplayKit,rmls/AsyncDisplayKit,rmls/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,flovouin/AsyncDisplayKit,harryworld/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,rmls/AsyncDisplayKit,lappp9/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,maicki/AsyncDisplayKit,flovouin/AsyncDisplayKit,JetZou/AsyncDisplayKit,flovouin/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,maicki/AsyncDisplayKit,lappp9/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,harryworld/AsyncDisplayKit,maicki/AsyncDisplayKit,romyilano/AsyncDisplayKit,maicki/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,romyilano/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,flovouin/AsyncDisplayKit,flovouin/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,harryworld/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit