Update README.md

Add blurp on my new intentions on how to step towards closing cefsharp/CefSharp#137 - but solving "the red layer" in the cef-binary repo (and possibly Xilium.CefGlue#61 over on bitbucket https://bitbucket.org/xilium/xilium.cefglue/issue/61/make-nuget-packages)
Update README.md

codepen.io link updated
Add cef32x32.gif for the package
+ a NuGet.exe (2.7)
First stab at a cef.redist native package
Available from https://staging.nuget.org/packages?q=cef&prerelease=true&sortOrder=package-created for a limited time
Rename Cef.targets to cef.redist.targets

Must match to package id for NuGet into MSBuild .target import install magic to happen
Merge pull request #3 from jornh/native-nuget

Native nuget