libgit2
===========================================================================

 #1 git_tree_entry_byname bug
    https://github.com/libgit2/libgit2/issues/127

 #2 git_tree_create_fromindex performance issues
    https://github.com/libgit2/libgit2/issues/75


pygit2
===========================================================================

 #1 Write the methods:

    - Repository.get(sha)
    - Tree.get(name)
    - Index.get(path)

    They will return None when the object is not there.

 #2 Write 'Tree_getitem_by_path', expose it as
    'Tree.get_entry_by_path'


itools.git
===========================================================================

 #1 Rewrite Worktree.walk to use two callbacks, for files and folders.
    Replace call to os.walk by Worktree.walk

 #2 Use 'os.path.join' to prepare for Windows support

 #3 Add docstrings

 #4 Implement "git status"
