[banshee/gtk3] Core: include ProviderConfiguration.cs in MSBuild and mark as static class

[Andrés Aragoneses <aaragoneses src gnome org>]

commit bcaff5a4d757b1b85b7335f74ee1f6a599c6e5d5
Author: Andres G. Aragoneses <knocte gmail com>
Date:   Mon Mar 11 20:48:36 2013 +0000

    Core: include ProviderConfiguration.cs in MSBuild and mark as static class
    
    These two nitpicks were forgotten in this commit:
    https://git.gnome.org/browse/banshee/commit/?h=gtk3&id=c8d3173843121c9cc4fdf7d57f83455bd0853e4d

 src/Core/Banshee.Core/Banshee.Core.csproj          |    1 +
 .../Banshee.IO/ProviderConfiguration.cs            |    2 +-
 2 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/Core/Banshee.Core/Banshee.Core.csproj b/src/Core/Banshee.Core/Banshee.Core.csproj
index 8664096..22650af 100644
--- a/src/Core/Banshee.Core/Banshee.Core.csproj
+++ b/src/Core/Banshee.Core/Banshee.Core.csproj
@@ -140,6 +140,7 @@
     <Compile Include="Banshee.Collection\IPodcastInfo.cs" />
     <Compile Include="Banshee.IO\Tests.cs" />
     <Compile Include="Banshee.Collection\YearInfo.cs" />
+    <Compile Include="Banshee.IO\ProviderConfiguration.cs" />
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="Resources\contributors.xml">
diff --git a/src/Core/Banshee.Core/Banshee.IO/ProviderConfiguration.cs 
b/src/Core/Banshee.Core/Banshee.IO/ProviderConfiguration.cs
index 777bdc8..95e384e 100644
--- a/src/Core/Banshee.Core/Banshee.IO/ProviderConfiguration.cs
+++ b/src/Core/Banshee.Core/Banshee.IO/ProviderConfiguration.cs
@@ -29,7 +29,7 @@ using Banshee.Configuration;
 
 namespace Banshee.IO
 {
-    public class ProviderConfiguration
+    public static class ProviderConfiguration
     {
         internal static readonly SchemaEntry<string> ProviderSchema = new SchemaEntry<string> (
             "core", "io_provider",