Refs #16 - Adds pimpmytheme settings schema.
Refs #16 - Updates doc link for pimpmytheme references.
Refs #16 - Adds pimpmytheme support info in doc.
Refs #16 - Adds pimpmytheme optional but coming in next release setting PIMPMYTHEME_GIT_REPOSITORY.
Refs #16 - Added links in docs/third-party.
Added support for django-pimpmytheme settings. Closes #16.
Refs #15 - Permits to caches templates loaders by accepting 'complex' sequences, ie: https://docs.djangoproject.com/en/1.6/ref/templates/api/#django.template.loaders.cached.Loader.