Remove obsolete methods

LibGit2Sharp/BranchCollection.cs

@@ -88,17 +88,6 @@ IEnumerator IEnumerable.GetEnumerator()
 
         #endregion
 
-        /// <summary>
-        ///   Checkout the branch with the specified by name.
-        /// </summary>
-        /// <param name = "shaOrReferenceName">The sha of the commit, a canonical reference name or the name of the branch to checkout.</param>
-        /// <returns></returns>
-        [Obsolete("This method will be removed in the next release. Please use Repository.Checkout() instead.")]
-        public Branch Checkout(string shaOrReferenceName)
-        {
-            return repo.Checkout(shaOrReferenceName);
-        }
-
         /// <summary>
         ///   Create a new local branch with the specified name
         /// </summary>

LibGit2Sharp/Tree.cs

@@ -1,5 +1,4 @@
-using System;
-using System.Collections;
+using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 using LibGit2Sharp.Core;
@@ -101,19 +100,6 @@ public IEnumerable<Blob> Blobs
             }
         }
 
-
-        /// <summary>
-        ///   Gets the <see cref = "Blob" />s immediately under this <see cref = "Tree" />.
-        /// </summary>
-        [Obsolete("This property will be removed in the next release. Please use Tree.Blobs instead.")]
-        public IEnumerable<Blob> Files
-        {
-            get
-            {
-                return Blobs;
-            }
-        }
-
         internal string Path
         {
             get { return path.Native; }