Fixed error and some warning returned by pylint

apps/common/views.py

@@ -1,15 +1,20 @@
 from django.shortcuts import redirect
 from django.utils.translation import ugettext as _
 from django.contrib import messages
-from django.http import HttpResponse, HttpResponseRedirect, Http404
+from django.http import HttpResponseRedirect
 
 
 def password_change_done(request):
+    '''View called when the new user password has been accepted'''
+    
     messages.success(request, _(u'Your password has been successfully changed.'))
     return redirect('home')
 
 
 def multi_object_action_view(request):
+    '''Proxy view called first when usuing a multi object action, which
+        then redirects to the appropiate specialized view'''
+        
     action = request.GET.get('action', None)
     id_list = u','.join([key[3:] for key in request.GET.keys() if key.startswith('pk_')])