Merge pull request #8 from predatell/master

support for Django 1.4 (LTS)
get_related_fields will now accept null field
This is used in an unreleased report builder api
Merge branch 'master' of https://github.com/burke-software/django-report-utils
Don't error out when encountering a django-hstore virtualfield
Support converting dict type to office open xml
Useful for supporting django-hstore
Merge pull request #1 from burke-software/master

Update