Log Message:
Updated py-dulwich to 0.16.3.

0.16.3	2016-01-14

 TEST FIXES

  * Remove racy check that relies on clock time changing between writes.
   (Jelmer Vernooij)

0.16.2	2016-01-14

 IMPROVEMENTS

  * Fixed failing test-cases on windows.
    (Koen Martens)

 API CHANGES

  * Repo is now a context manager, so that it can be easily
    closed using a ``with`` statement. (Søren Løvborg)

 TEST FIXES

  * Only run worktree list compat tests against git 2.7.0,
    when 'git worktree list' was introduced. (Jelmer Vernooij)

 BUG FIXES

  * Ignore filemode when building index when core.filemode
    is false.
    (Koen Martens)

  * Initialize core.filemode configuration setting by
    probing the filesystem for trustable permissions.
    (Koen Martens)

  * Fix ``porcelain.reset`` to respect the comittish argument.
    (Koen Martens)

  * Fix dulwich.porcelain.ls_remote() on Python 3.
    (#471, Jelmer Vernooij)

  * Allow both unicode and byte strings for host paths
    in dulwich.client. (#435, Jelmer Vernooij)

  * Add remote from porcelain.clone. (#466, Jelmer Vernooij)

  * Fix unquoting of credentials before passing to urllib2.
    (#475, Volodymyr Holovko)

  * Cope with submodules in `build_index_from_tree`.
    (#477, Jelmer Vernooij)

  * Handle deleted files in `get_unstaged_changes`.
    (#483, Doug Hellmann)

  * Don't overwrite files when they haven't changed in
    `build_file_from_blob`.
    (#479, Benoît HERVIER)

  * Check for existence of index file before opening pack.
    Fixes a race when new packs are being added.
    (#482, wme)