fixed up NIOverview.m so that it will compile on iOS 8
fixed up NIOverview.m so that it will compile on iOS 8

weiyanwu1984/nimbus,chanffdavid/nimbus,compositeprimes/nimbus,treejames/nimbus,SuPair/nimbus,JyHu/nimbus,kviksilver/nimbus,panume/nimbus,dachaoisme/nimbus,Guokr1991/nimbus,hanangellove/nimbus,dieface/nimbus,JyHu/nimbus,panume/nimbus,panume/nimbus,bangquangvn/nimbus,JyHu/nimbus,WeeTom/nimbus,DreamHill/nimbus,LcongGitHub/nimbus,bangquangvn/nimbus,cnbin/nimbus,zilaiyedaren/nimbus,Guokr1991/nimbus,dachaoisme/nimbus,LcongGitHub/nimbus,andaluz/nimbus,dmishe/nimbus,dachaoisme/nimbus,hanangellove/nimbus,zilaiyedaren/nimbus,SuPair/nimbus,quyixia/nimbus,chanffdavid/nimbus,marcobgoogle/nimbus,ycaihua/nimbus,compositeprimes/nimbus,michaelShab/nimbus,cnbin/nimbus,treejames/nimbus,mohsinalimat/nimbus,jverkoey/nimbus,kviksilver/nimbus,kisekied/nimbus,marcobgoogle/nimbus,bangquangvn/nimbus,cnbin/nimbus,DreamHill/nimbus,bogardon/nimbus,tranhieutt/nimbus,kviksilver/nimbus,quyixia/nimbus,chanffdavid/nimbus,zaichang/nimbus,zilaiyedaren/nimbus,mohsinalimat/nimbus,compositeprimes/nimbus,weiyanwu1984/nimbus,WeeTom/nimbus,compositeprimes/nimbus,xiaohongjun0509/nimbus,JyHu/nimbus,marcobgoogle/nimbus,jverkoey/nimbus,liuwu/nimbus,andaluz/nimbus,WeeTom/nimbus,Arcank/nimbus,weiyanwu1984/nimbus,tranhieutt/nimbus,mohsinalimat/nimbus,zilaiyedaren/nimbus,dieface/nimbus,dachaoisme/nimbus,weiyanwu1984/nimbus,andaluz/nimbus,bogardon/nimbus,JyHu/nimbus,kviksilver/nimbus,panume/nimbus,Arcank/nimbus,Arcank/nimbus,andaluz/nimbus,tranhieutt/nimbus,zilaiyedaren/nimbus,JyHu/nimbus,andaluz/nimbus,jverkoey/nimbus,compositeprimes/nimbus,jverkoey/nimbus,treejames/nimbus,cnbin/nimbus,kisekied/nimbus,DreamHill/nimbus,DreamHill/nimbus,tranhieutt/nimbus,cnbin/nimbus,michaelShab/nimbus,tranhieutt/nimbus,bogardon/nimbus,Guokr1991/nimbus,LcongGitHub/nimbus,dieface/nimbus,mohsinalimat/nimbus,dmishe/nimbus,chanffdavid/nimbus,jverkoey/nimbus,weiyanwu1984/nimbus,zaichang/nimbus,cnbin/nimbus,bangquangvn/nimbus,liuwu/nimbus,hanangellove/nimbus,dmishe/nimbus,DreamHill/nimbus,compositeprimes/nimbus,ycaihua/nimbus,michaelShab/nimbus,panume/nimbus,bangquangvn/nimbus,bogardon/nimbus,xiaohongjun0509/nimbus,dmishe/nimbus,hanangellove/nimbus,Arcank/nimbus,xiaohongjun0509/nimbus,quyixia/nimbus,liuwu/nimbus,treejames/nimbus,kviksilver/nimbus,Arcank/nimbus,Guokr1991/nimbus,ycaihua/nimbus,marcobgoogle/nimbus,LcongGitHub/nimbus,zaichang/nimbus,ycaihua/nimbus,kisekied/nimbus,kviksilver/nimbus,hanangellove/nimbus,ycaihua/nimbus,weiyanwu1984/nimbus,liuwu/nimbus,zaichang/nimbus,dieface/nimbus,liuwu/nimbus,bogardon/nimbus,xiaohongjun0509/nimbus,zaichang/nimbus,Guokr1991/nimbus,bogardon/nimbus,dmishe/nimbus,quyixia/nimbus,marcobgoogle/nimbus,dieface/nimbus,kisekied/nimbus,compositeprimes/nimbus,hanangellove/nimbus,ycaihua/nimbus,LcongGitHub/nimbus,WeeTom/nimbus,bogardon/nimbus,bangquangvn/nimbus,xiaohongjun0509/nimbus,treejames/nimbus,dachaoisme/nimbus,LcongGitHub/nimbus,mohsinalimat/nimbus,quyixia/nimbus,liuwu/nimbus,marcobgoogle/nimbus,JyHu/nimbus,SuPair/nimbus,zilaiyedaren/nimbus,michaelShab/nimbus,WeeTom/nimbus,dmishe/nimbus,tranhieutt/nimbus,zaichang/nimbus,SuPair/nimbus,kisekied/nimbus,DreamHill/nimbus,quyixia/nimbus,dieface/nimbus,quyixia/nimbus,xiaohongjun0509/nimbus,jverkoey/nimbus,michaelShab/nimbus,michaelShab/nimbus,kisekied/nimbus,chanffdavid/nimbus,panume/nimbus,jverkoey/nimbus,SuPair/nimbus,mohsinalimat/nimbus,WeeTom/nimbus,chanffdavid/nimbus,marcobgoogle/nimbus,treejames/nimbus,Arcank/nimbus,Arcank/nimbus,andaluz/nimbus,dachaoisme/nimbus,Guokr1991/nimbus,SuPair/nimbus