Fix fields in query_select_related fixture

This fixture was incorrect - it has never loaded correctly
however the exception was not raised in a way that caused
the benchmark to fail in Django <= 1.4
Added two resolver benchmarks: a long flat list and nested tree of patterns.
Merge pull request #11 from lqc/resolver_bench

Added two resolver benchmarks
Merge pull request #9 from ptone/fixture-fix

Fix fields in query_select_related fixture
Updated README.
More README tweaks.
Avoid importing url creation utilities from `django.conf.urls.defaults` when possible.
More accurate README.
Fixed setup.py URL
Fixed README.rst to point to github/django/djangobench
Added prefetch_related benchmark