Removed the NoWarn for missing comments

src/ProtocolBuffers.Test/ProtocolBuffers.Test.csproj

@@ -45,10 +45,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
-    <DocumentationFile>
-    </DocumentationFile>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
-    <NoWarn>1591</NoWarn>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -58,10 +55,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
-    <DocumentationFile>
-    </DocumentationFile>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
-    <NoWarn>1591</NoWarn>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="nunit.framework, Version=2.2.8.0, Culture=neutral, PublicKeyToken=96d09a1eb7f44a77">