update libgit2sharp to v0.12

GitTfs/Core/GitCommit.cs

@@ -23,11 +23,11 @@ namespace Sep.Git.Tfs.Core
                 var currentTree = treesToDescend.Dequeue();
                 foreach(var entry in currentTree)
                 {
-                    if(entry.Type == GitObjectType.Tree)
+                    if (entry.TargetType == TreeEntryTargetType.Tree)
                     {
                         treesToDescend.Enqueue((Tree)entry.Target);
                     }
-                    else if (entry.Type == GitObjectType.Blob)
+                    else if (entry.TargetType == TreeEntryTargetType.Blob)
                     {
                         yield return new GitTreeEntry(entry);
                     }

GitTfs/Core/GitRepository.cs

@@ -375,7 +375,7 @@ namespace Sep.Git.Tfs.Core
                 var currentTree = treesToDescend.Dequeue();
                 foreach (var item in currentTree)
                 {
-                    if (item.Type == GitObjectType.Tree)
+                    if (item.TargetType == TreeEntryTargetType.Tree)
                     {
                         treesToDescend.Enqueue((Tree)item.Target);
                     }
@@ -384,7 +384,7 @@ namespace Sep.Git.Tfs.Core
                     {
                         Mode = item.Mode.ToModeString(),
                         Sha = item.Target.Sha,
-                        ObjectType = item.Type.ToString().ToLower(),
+                        ObjectType = item.TargetType.ToString().ToLower(),
                         Path = path,
                         Commit = commit
                     };

GitTfs/Core/GitTreeEntry.cs

@@ -22,7 +22,7 @@ namespace Sep.Git.Tfs.Core
 
         public Stream OpenRead()
         {
-            if (_entry.Type == GitObjectType.Blob)
+            if (_entry.TargetType == TreeEntryTargetType.Blob)
             {
                 return ((Blob)_entry.Target).ContentStream;
             }