Fixed #16360 -- Added WSGI entrypoint to startproject layout, and enabled internal servers (runserver and runfcgi) to use an externally-defined WSGI application. Thanks to Armin Ronacher, Jannis Leidel, Alex Gaynor, ptone, and Jacob Kaplan-Moss.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17022 bcc190cf-cafb-0310-a4f2-bffc1f526a37