add dashboard app

- add new dashboard app providing dashboards for anonymous and logged in users
- cleanup gnuviechadmin.urls:
  - import dashboard.urls and include dashboard_urls at URL root
  - import authentication urls and include them below /auth
  - remove generated commented code

gnuviechadmin/dashboard/urls.py

@@ -0,0 +1,16 @@
+from __future__ import absolute_import, unicode_literals
+
+from django.conf.urls import patterns, url
+
+from .views import (
+    IndexView,
+    UserDashboardView,
+)
+
+
+urlpatterns = patterns(
+    '',
+    url(r'^$', IndexView.as_view(), name='dashboard'),
+    url(r'^user/(?P<slug>[\w0-9@.+-_]+)/$',
+        UserDashboardView.as_view(), name='customer_dashboard'),
+)