Pass a Tree instead of a sha in the LogEntry.

GitTfs/Core/GitTfsRemote.cs

@@ -593,7 +593,7 @@ namespace Sep.Git.Tfs.Core
 
         private string[] BuildCommitCommand(LogEntry logEntry)
         {
-            var commitCommand = new List<string> { "commit-tree", logEntry.Tree };
+            var commitCommand = new List<string> { "commit-tree", logEntry.Tree.Sha };
             foreach (var parent in logEntry.CommitParents)
             {
                 commitCommand.Add("-p");

GitTfs/Core/GitTreeBuilder.cs

@@ -34,9 +34,9 @@ namespace Sep.Git.Tfs.Core
             _treeDefinition.Remove(path);
         }
 
-        public string GetTree()
+        public Tree GetTree()
         {
-            return _objectDatabase.CreateTree(_treeDefinition).Sha;
+            return _objectDatabase.CreateTree(_treeDefinition);
         }
     }
 }

GitTfs/Core/IGitTreeBuilder.cs

@@ -1,4 +1,6 @@
-namespace Sep.Git.Tfs.Core
+using LibGit2Sharp;
+
+namespace Sep.Git.Tfs.Core
 {
     public interface IGitTreeModifier
     {
@@ -8,6 +10,6 @@
 
     public interface IGitTreeBuilder : IGitTreeModifier
     {
-        string GetTree();
+        Tree GetTree();
     }
 }

GitTfs/Core/LogEntry.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using LibGit2Sharp;
 
 namespace Sep.Git.Tfs.Core
 {
@@ -11,7 +12,7 @@ namespace Sep.Git.Tfs.Core
         }
 
         public string AuthorName { get; set; }
-        public string Tree { get; set; }
+        public Tree Tree { get; set; }
 
         public IList<string> CommitParents { get; private set; }