removed the unnecessary pytz requirement
Merge branch 'develop' of github.com:ambitioninc/django-data-schema into develop
data schema returns None if the field key doenst exist
updated flake8
Merge pull request #35 from wesleykendall/develop

Data schema returns None for field values that aren't in the object
Merge pull request #36 from ambitioninc/develop

Data schema returns None for field values that aren't in the object