Drop handling of python installations without wsgiref, as dulwich no longer supports them.
Use optparse to handle options in dulwich.web.main, support --port and --listen_address arguments.
Merge dul-web into dulwich command.
Add porcelain for branch delete/list/create.
Add 'fetch' porcelain.
Split out build_file_from_blob.
Add tag_delete porcelain.
Add ShaFile.copy()

Provide a convenient copy method for ShaFiles.

Signed-off-by: Jelmer Vernooij <jelmer@samba.org>
Sort imports alphabetically.
Merge branch 'master' of git://github.com/jelmer/dulwich