OneGet is a Package Management Aggregator -- it's basically a core module that anyone can write a plugin (what we call Providers) and creates a consistent interface for software discovery, installation and inventory.  

Severity Code Description Project File Line Suppression State
Warning Some NuGet packages were installed using a target framework different from the current target framework and may need to be reinstalled. Visit http://docs.nuget.org/docs/workflows/reinstalling-packages for more information.  Packages affected: Microsoft.Net.Http Iris.Web 0    

C# runtime library for Protocol Buffers - Google's data interchange format. 

Nuget Package : https://www.nuget.org/packages/Google.Protobuf 

The NuGet 4.0 Package Manager Extension is currently not available for Visual Studio 2015 

PM> Install-Package Prism.StructureMapExtensions