Remove unused import.
Fix delete remote refs

Skip waiting for pack data if only one pull
command is received and this is a delete
command.

Signed-off-by: Jelmer Vernooij <jelmer@samba.org>
Add unittest for issue del ref (issue #108)

Add a test for _apply_pack of ReceivePackHandler
in order to test deleting a ref.

Signed-off-by: Jelmer Vernooij <jelmer@samba.org>
Support running 'dulwich.server' and 'dulwich.web' using 'python -m'.
Remove some trailing whitespace.
Add some compat tests for removing refs during push.
Skip remove branch test for dumb web case.