link from hostingpackages details to add_userdatabase

- add database URLs to gnuviechadmin.urls
- add link in template hostingpackages/customerhostingpackage_detail.html
- add changelog entry for new feature

gnuviechadmin/gnuviechadmin/urls.py

@@ -10,6 +10,7 @@ urlpatterns = patterns(
     '',
     url(r'', include('dashboard.urls')),
     url(r'^accounts/', include('allauth.urls')),
+    url(r'^database/', include('userdbs.urls')),
     url(r'^domains/', include('domains.urls')),
     url(r'^hosting/', include('hostingpackages.urls')),
     url(r'^mail/', include('managemails.urls')),