Require login for proposal submit

- This has the effect of bouncing people to the login page if they're
  unauthenticated, rather than returning a 502 because 'home' doesn't
  exist.

- If they're authenticated but don't have a speaker profile, send them
  to the speaker profile create page rather than just to the
  dashboard.

Closes #26

vendor/symposion/proposals/views.py

@@ -60,18 +60,15 @@ def proposal_submit(request):
         "kinds": kinds,
     })
 
-
+@login_required
 def proposal_submit_kind(request, kind_slug):
 
     kind = get_object_or_404(ProposalKind, slug=kind_slug)
 
-    if not request.user.is_authenticated():
-        return redirect("home")  # @@@ unauth'd speaker info page?
-    else:
-        try:
-            speaker_profile = request.user.speaker_profile
-        except ObjectDoesNotExist:
-            return redirect("dashboard")
+    try:
+        speaker_profile = request.user.speaker_profile
+    except ObjectDoesNotExist:
+        return redirect("speaker_create")
 
     if not kind.section.proposalsection.is_available():
         return redirect("proposal_submit")