Make Index.Remove() cope with files which have been modified in the w…

…orking directory

Fixes issue libgit2#95 - 2/2.

One can't GitRemove a modified file.

$ mkdir test
$ cd test
$ git init .
$ echo "a" > a.txt
$ git add .
$ git commit -m "Initial commit"

$ echo "b" >> a.txt

$ git status
no changes added to commit (use "git add" and/or "git commit -a")

$ git rm a.txt
error: 'a.txt' has local modifications
(use --cached to keep the file, or -f to force removal)

LibGit2Sharp.Tests/IndexFixture.cs

@@ -479,6 +479,7 @@ public void CanRemoveAFile(string filename, FileStatus initialStatus, bool shoul
         }
 
         [TestCase("deleted_staged_file.txt")]
+        [TestCase("modified_unstaged_file.txt")]
         [TestCase("shadowcopy_of_an_unseen_ghost.txt")]
         public void RemovingAInvalidFileThrows(string filepath)
         {

LibGit2Sharp/Index.cs

@@ -343,7 +343,7 @@ public void Remove(IEnumerable<string> paths)
                     throw new NotImplementedException();
                 }
 
-                if (!keyValuePair.Value.HasAny(new[] { FileStatus.Nonexistent, FileStatus.Removed, FileStatus.Untracked }))
+                if (!keyValuePair.Value.HasAny(new[] { FileStatus.Nonexistent, FileStatus.Removed, FileStatus.Modified, FileStatus.Untracked }))
                 {
                     continue;
                 }