Changed installation folder to subfolder.

And simplified.

Author: grokys

src/GitHub.VisualStudio/GitHub.VisualStudio.csproj

@@ -15,7 +15,7 @@
     <OutputPath>..\..\build\$(Configuration)\</OutputPath>
     <VsixType>v3</VsixType>
     <IsProductComponent>false</IsProductComponent>
-    <ExtensionInstallationFolder>GitHub Extension for Visual Studio</ExtensionInstallationFolder>
+    <ExtensionInstallationFolder>GitHub\GitHub</ExtensionInstallationFolder>
   </PropertyGroup>
   <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
   <PropertyGroup>