[banshee] Fix editor always prompting to save podcasts

[Gabriel Burt <gburt src gnome org>]

commit 26c377ebab4e29d2b2cca18e0dbab74567d768dc
Author: David Stone <david gixug com>
Date:   Tue Sep 8 13:06:14 2009 -0700

    Fix editor always prompting to save podcasts
    
    By removing ReleaseDate from the Exportable fields (BGO #584880)
    
    Signed-off-by: Gabriel Burt <gabriel burt gmail com>

 .../Banshee.Core/Banshee.Collection/TrackInfo.cs   |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/src/Core/Banshee.Core/Banshee.Collection/TrackInfo.cs b/src/Core/Banshee.Core/Banshee.Collection/TrackInfo.cs
index 0b0acdd..6a4c340 100644
--- a/src/Core/Banshee.Core/Banshee.Collection/TrackInfo.cs
+++ b/src/Core/Banshee.Core/Banshee.Collection/TrackInfo.cs
@@ -276,7 +276,6 @@ namespace Banshee.Collection
             get { return null; }
         }
         
-        [Exportable]
         public virtual DateTime ReleaseDate {
             get { return release_date; }
             set { release_date = value; }