Fix bug with history helper templatetag

Symptom:
Adding to basket did not work

Cause:
Was not passing the request variable as part of the context and so the
basket form could not be generated.  Hence adding to basket led to an
error.

Solution:
Add request to the context returned by the helper function.

oscar/templates/oscar/catalogue/detail.html

             </div>
         </div>
         {% endif %}
-    {% recently_viewed_products %}
+
+		{% recently_viewed_products %}
+
     </div>
 </article><!-- End of product page -->
 {% endblock content %}

oscar/templates/oscar/customer/history/recently_viewed_products.html

         </ul>
     </div>
 </div>
-<!-- End Elastislide Carousel -->
 {% endif %}

oscar/templatetags/history_tags.py

 from django.db.models import get_model
 
 from oscar.core.loading import get_class
+
 Product = get_model('catalogue', 'Product')
 get_recently_viewed_product_ids = get_class('customer.history_helpers',
                                             'get_recently_viewed_product_ids')
 @register.inclusion_tag('customer/history/recently_viewed_products.html',
                         takes_context=True)
 def recently_viewed_products(context):
-    u"""
+    """
     Inclusion tag listing the most recently viewed products
     """
     request = context['request']
     product_ids = get_recently_viewed_product_ids(request)
 
-    try:
-        current_product = context.get('product', None)
+    current_product = context.get('product', None)
+    if current_product.id in product_ids:
         product_ids.remove(current_product.id)
-    except (ValueError, AttributeError):
-        pass
-
-    product_dict = Product.browsable.in_bulk(product_ids)
 
     # Reordering as the id order gets messed up in the query
+    product_dict = Product.browsable.in_bulk(product_ids)
     product_ids.reverse()
     products = [product_dict[id] for id in product_ids if id in product_dict]
-    return {'products': products}
+    return {'products': products,
+            'request': request}