Set ExtensionInstallationFolder

To make sure that the extension is always installed to the same
directory.

Author: grokys

src/GitHub.VisualStudio/GitHub.VisualStudio.csproj

@@ -15,6 +15,7 @@
     <OutputPath>..\..\build\$(Configuration)\</OutputPath>
     <VsixType>v3</VsixType>
     <IsProductComponent>false</IsProductComponent>
+    <ExtensionInstallationFolder>GitHub Extension for Visual Studio</ExtensionInstallationFolder>
   </PropertyGroup>
   <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
   <PropertyGroup>