Add Windows 8 as netcore platform to the PCL nuspec.
Add Windows 8 as netcore platform to the PCL nuspec.

TukekeSoft/CocosSharp,MSylvia/CocosSharp,zmaruo/CocosSharp,netonjm/CocosSharp,mono/CocosSharp,TukekeSoft/CocosSharp,hig-ag/CocosSharp,haithemaraissia/CocosSharp,zmaruo/CocosSharp,MSylvia/CocosSharp,hig-ag/CocosSharp,netonjm/CocosSharp,haithemaraissia/CocosSharp,mono/CocosSharp