randomElements typo to randomElement

https://github.com/joke2k/faker/blob/master/faker/providers/__init__.py declares "randomElement" not "randomElements"
return retrieved random object from relatedModel

build_relation would return None even if a relatedModel object was found, because the object retrieved was not returned
Merge https://github.com/rajington/django-faker

Conflicts:
	django_faker/populator.py
Add timezone awareness support
Support faking multiple ForeignKey relationships