Redirect anonymous proposal submitters to login.

Redirect visitors to the proposal submission page who are not already
logged in to the login page, as opposed to the homepage. This prevents
proposal submission from breaking if no "home" view is defined.

Author: martey

symposion/proposals/views.py

@@ -43,7 +43,7 @@ def proposal_submit(request):
         messages.info(request, _("To submit a proposal, please "
                                  "<a href='{0}'>log in</a> and create a speaker profile "
                                  "via the dashboard.".format(settings.LOGIN_URL)))
-        return redirect("home")  # @@@ unauth'd speaker info page?
+        return redirect("account_login")
     else:
         try:
             request.user.speaker_profile