Get rid of junk in project files

Ix.NET/Source/System.Interactive.Async.Providers/System.Interactive.Async.Providers.csproj

@@ -21,8 +21,4 @@
     <Compile Update="System\Linq\AsyncQueryableEx.Generated.cs" DesignTime="True" AutoGen="True" DependentUpon="AsyncQueryableEx.Generated.tt" />
   </ItemGroup>
 
-  <ItemGroup>
-    <Service Include="{508349b6-6b84-4df5-91f0-309beebad82d}" />
-  </ItemGroup>
-
 </Project>

Ix.NET/Source/System.Interactive.Async/System.Interactive.Async.csproj

@@ -22,9 +22,5 @@
   <ItemGroup>
     <ProjectReference Include="..\System.Linq.Async\System.Linq.Async.csproj" />
   </ItemGroup>
-
-  <ItemGroup>
-    <Folder Include="System\Threading\Tasks\" />
-  </ItemGroup>
   
 </Project>