Removed unused references that were causing problems for the .Net 3.5 build.

Author: ivanpointer

Take2/NuLog/NuLog.csproj

@@ -71,9 +71,7 @@
     <Reference Include="System.Core" />
     <Reference Include="System.Xml.Linq" />
     <Reference Include="System.Data.DataSetExtensions" />
-    <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Data" />
-    <Reference Include="System.Net.Http" />
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>