Add Count property, skip enumeration when only # of changes is important

Author: niik

LibGit2Sharp/TreeChanges.cs

@@ -38,7 +38,7 @@ internal TreeChanges(DiffSafeHandle diff)
         /// <param name="changeKind">Change type to filter on.</param>
         private IEnumerable<TreeEntryChanges> GetChangesOfKind(ChangeKind changeKind)
         {
-            for (int i = 0; i < count.Value; i++)
+            for (int i = 0; i < Count; i++)
             {
                 var delta = Proxy.git_diff_get_delta(diff, i);
 
@@ -60,7 +60,7 @@ private static TreeEntryChanges ToTreeEntryChange(GitDiffDelta delta)
         /// <returns>An <see cref="IEnumerator{T}"/> object that can be used to iterate through the collection.</returns>
         public virtual IEnumerator<TreeEntryChanges> GetEnumerator()
         {
-            for (int i = 0; i < count.Value; i++)
+            for (int i = 0; i < Count; i++)
             {
                 yield return new TreeEntryChanges(Proxy.git_diff_get_delta(diff, i));
             }
@@ -141,6 +141,14 @@ public virtual IEnumerable<TreeEntryChanges> Conflicted
             get { return GetChangesOfKind(ChangeKind.Conflicted); }
         }
 
+        /// <summary>
+        /// Gets the number of <see cref="TreeEntryChanges"/> in this comparison.
+        /// </summary>
+        public virtual int Count
+        {
+            get { return count.Value; }
+        }
+
         private string DebuggerDisplay
         {
             get