Merge branch 'prototyping' into feature/dotnetcore

# Conflicts:
#	R.NET/RDotNet.csproj
#	RDotNet.FSharp.Tests/RDotNet.FSharp.Tests.fsproj
#	RDotNet.FSharp/RDotNet.FSharp.fsproj
#	RDotNet.Graphics.Tests/RDotNet.Graphics.Tests.csproj
#	RDotNet.NativeLibrary/RDotNet.NativeLibrary.csproj
#	RDotNet.TestBase/RDotNet.TestBase.csproj
#	RDotNet.Tests/RDotNet.Tests.csproj
#	TestApps/SimpleTest/SimpleTest.csproj
#	TestApps/StressTest/StressTest.csproj