Django 1.4.0 => 1.4.3, gunicorn => 0.17.2

Tests pass.  gunicorn change logs don't indicate
any API breakage.

http://docs.gunicorn.org/en/latest/2012-news.html
and
http://docs.gunicorn.org/en/latest/2013-news.html
Alias admin with 2-char prefixes
Fixed csvimport after change on OPs csv-format
bill_type modifed to be read-only
fixed parsing to show also email addresses
Merge pull request #62 from annttu/logging-fix

Fixed logging on membership/edit page.
Merge pull request #61 from annttu/topic/readonly

Bill_type modifed to be read-only
Merge pull request #60 from annttu/csv-fix

Fixed CSV-import
Merge pull request #59 from guaq/topic/alias-search-in-admin

Alias admin with 2-char prefix filtering
Merge pull request #58 from guaq/topic/django-1-4-3-and-gunicorn-0-17-2

Django 1.4.0 => 1.4.3, gunicorn => 0.17.2