Merge branch 'release/0.7.1' into develop
Merge branch 'hotfix/0.7.1.1' into develop
Make RemoteForeignKey to be nullable
Merge branch 'master' of https://github.com/jsaytoe/django-slumber into develop
Fixed up NULL handling problems for the database fields on RemoteForeignKey

Thanks to Jsaytoe.
Added a nullable RemoteForeignKey field to the test models
Bumped version number.
Merge branch 'release/0.7.2'