add django.core.context_processors.request to example project

[David Seddon]

This should be added to the example project's settings.py, otherwise it doesn't work:

from django.conf import global_settings

TEMPLATE_CONTEXT_PROCESSORS = global_settings.TEMPLATE_CONTEXT_PROCESSORS + (
    'django.core.context_processors.request',
)

[Craig Nagy]

Thanks resolved by PR#27