README and a bit of logging in inner DS feature

Author: peppelinux

README.rst

@@ -695,6 +695,17 @@ example::
   coverage report -m
 
 
+Contributing
+============
+
+Please open Issues to start debate regarding the requested
+features, or the patch that you would apply. We do not use
+a strict submission format, please try to be more concise as possibile.
+
+The Pull Request MUST be done on the dev branch, please don't
+push code directly on the master branch.
+
+
 FAQ
 ===
 

djangosaml2/views.py

@@ -146,10 +146,12 @@ def login(request,
         kwargs['allow_create'] = "true"
 
     # Do we have a Discovery Service?
-    discovery_service = getattr(settings, 'SAML2_DISCO_URL', False)
+    discovery_service = getattr(settings, 'SAML2_DISCO_URL', None)
     if discovery_service and not selected_idp:
         # We have to build the URL to redirect to with all the information
         # for the Discovery Service to know how to send the flow back to us
+        logger.debug(("A discovery process is needed trough a"
+                      "Discovery Service: {}").format(discovery_service))
         login_url = request.build_absolute_uri(reverse('saml2_login'))
         login_url = '{0}?next={1}'.format(login_url,
                                           urlquote(came_from, safe=''))
@@ -162,7 +164,7 @@ def login(request,
     # is a embedded wayf needed?
     idps = available_idps(conf)
     if selected_idp is None and len(idps) > 1:
-        logger.debug('A discovery process is needed')
+        logger.debug('A discovery process is needed trough WAYF page')
         return render(request, wayf_template, {
                 'available_idps': idps.items(),
                 'came_from': came_from,