include commit link (#31)

Author: Jinhuafei

src/Packages/Microsoft.CodeDom.Providers.DotNetCompilerPlatform/Microsoft.CodeDom.Providers.DotNetCompilerPlatform.nuspec

@@ -7,7 +7,10 @@
         <authors>Microsoft</authors>
         <owners>Microsoft</owners>
         <copyright>&#169; Microsoft Corporation. All rights reserved.</copyright>
-        <description>Replacement CodeDOM providers that use the new .NET Compiler Platform ("Roslyn") compiler as a service APIs. This provides support for new language features in systems using CodeDOM (e.g. ASP.NET runtime compilation) as well as improving the compilation performance of these systems.</description>
+        <description>Replacement CodeDOM providers that use the new .NET Compiler Platform ("Roslyn") compiler as a service APIs. This provides support for new language features in systems using CodeDOM (e.g. ASP.NET runtime compilation) as well as improving the compilation performance of these systems.
+        
+        This package was built from the source at $GitCommitLink$
+        </description>
         <summary>Replacement CodeDOM providers that use the new .NET Compiler Platform ("Roslyn") compiler as a service APIs.</summary>
         <language>en-US</language>
         <projectUrl>http://www.asp.net/</projectUrl>

tools/RoslynCodeProvider.targets

@@ -3,6 +3,7 @@
     <!-- Build order -->
     <PropertyGroup>
         <BuildDependsOn>SetNuSpecProperties;DownloadRoslynBinariesToToolsFolder;$(BuildDependsOn)</BuildDependsOn>
+        <GitCommitLink Condition=" '$(GitCommitLink)' == '' "></GitCommitLink>
     </PropertyGroup>
 
     <Import Project="$(MSBuildThisFileDirectory)version.targets"/>
@@ -23,6 +24,7 @@
             <NuSpecProperties>
                 NuGetPackageVersion=$(NuGetPackageVersion);
                 NuGetPackageId=$(NuGetPackageId);
+                GitCommitLink=$(GitCommitLink);
             </NuSpecProperties>
         </PropertyGroup>
     </Target>