fix pieces of django 1.8 compatibility

passerelle_montpellier_encombrants/forms.py

@@ -87,6 +87,7 @@ class CommuneForm(forms.ModelForm):
 
     class Meta:
         model = Commune
+        fields = '__all__'
 
     def save(self):
         obj = super(CommuneForm, self).save()
@@ -104,6 +105,7 @@ class SectorForm(forms.ModelForm):
                             help_text=_('separated by commas'))
     class Meta:
         model = Sector
+        fields = '__all__'
 
 
 class StreetsForm(forms.Form):

passerelle_montpellier_encombrants/utils.py

@@ -23,7 +23,8 @@ from io import BytesIO
 from django.core.mail import EmailMessage
 from django.conf import settings
 from django.utils.translation import ugettext_lazy as _
-from django.template.loader import get_template, Context
+from django.template import Context
+from django.template.loader import get_template
 
 from .models import Commune
 from .ods import Workbook