Improve Django template performance

Hi guys,

So it's rumored that Django template is slow, but in fact there's a missed setting since Django 1.2


https://docs.djangoproject.com/en/1.2/ref/templates/api/#loader-types

By using `django.template.loaders.cached.Loader`, django doesn't have to look up piles of directories and read template file from harddisk everytime. This is common practice for production Django stacks. 

Please add, thanks!