Added python-urlgrabber dependency

Startup of cobblerd fails, because package python-urlgrabber
is not installed: "ImportError: No module named urlgrabber"
Added dependency to fix this issue.
Added python-django dependency

Application returns http status 500 after activation in apache2.
Error log contains this message:
"ImportError: No module named django.core.handlers.wsgi"
Fixed this issue by adding python-django as dependency.
Added libapache2-mod-wsgi dependency

Fixing error "Invalid command 'WSGIScriptAliasMatch'"
during apache2 startup by adding this dependency.
Merge pull request #1207 from SpringerPE/master

Adding missing dependencies in debian build