Infinite Pagination improvements

[diox]

It's probably completely incompatible with your version as it is so I won't submit a pull request, but there are some nice changes to InfinitePagination, including using it directly from the templatetag, in our fork here: https://github.com/liberation/django-pagination/

(most changes come from https://github.com/rizumu/django-pagination/tree/add_backwards_option but we added a couple of nice improvements)

I don't have the time to work on adapting the changes to your fork at the moment, so I'm submitting this issue in case someone else has :-)