Add context_keys to TemplatesGenerator for Django 1.5 support

MODEL_NAME_archive_year.html uses 'year' the context of YearArchiveView.

But, on Django 1.5, it is returned as a date object.

So the template must use 'year.year'.

In order to maintain backward compatibility, add context_keys and
set proper key depending on the version of Django.

generate_scaffold/generators/templates.py

@@ -1,5 +1,6 @@
 import os
 
+from django import VERSION as DJANGO_VERSION
 from django.template import Context
 from django.template.defaultfilters import slugify
 from django.template.loader import get_template
@@ -27,6 +28,10 @@ def render_templates(
             model, timestamp_fieldname)
         is_timestamped = True if timestamp_field else False
 
+        context_keys = {
+            'year': 'year.year' if DJANGO_VERSION >= (1, 5) else 'year'
+        }
+
         for template_template in template_templates:
 
             if not is_timestamped and '_archive' in template_template:
@@ -44,6 +49,7 @@ def render_templates(
                 'class_name': class_name,
                 'filename': dst_abspath,
                 'is_timestamped': is_timestamped,
+                'context_keys': context_keys
             }
             if is_timestamped:
                 c['timestamp_field'] = timestamp_field.name

generate_scaffold/templates/generate_scaffold/tpls/MODEL_NAME_archive_year.html

@@ -20,15 +20,15 @@
       </span>
     </li>
     <li>
-      <a href='{% templatetag openblock %} url '{{ app_name }}_{{ model_slug }}_year_archive' year=year {% templatetag closeblock %}'>
+      <a href='{% templatetag openblock %} url '{{ app_name }}_{{ model_slug }}_year_archive' year={{ context_keys.year }} {% templatetag closeblock %}'>
         {% templatetag openblock %} trans "{% trans "Year Archive" %}" {% templatetag closeblock %}
       </a>
     </li>
   </ul>
 {% templatetag openblock %} endblock {% templatetag closeblock %}
 
 {% templatetag openblock %} block header-link {% templatetag closeblock %}
-  <a href='{% templatetag openblock %} url '{{ app_name }}_{{ model_slug }}_year_archive' year=year {% templatetag closeblock %}'>
+  <a href='{% templatetag openblock %} url '{{ app_name }}_{{ model_slug }}_year_archive' year={{ context_keys.year }} {% templatetag closeblock %}'>
     {% templatetag openblock %} trans "{% blocktrans %}{{ class_name }} Year Archive{% endblocktrans %}" {% templatetag closeblock %}
   </a>
 {% templatetag openblock %} endblock {% templatetag closeblock %}