PLD: clean up non owner test
PLD: endpoint to change the role of an org member, closes #554
PLD: typo and add descriptive error
Merge pull request #566 from onaio/554-role-change-endpoint

554 role change endpoint
UK: openpyxl date_time module moved
UK: djangorestframework api update, validation error is no longer thrown
UK: djangorestframework api update, if none only fields returned
UK: djangorestframework api update, .model deprecated
UK: mimetype is deprecated, using content_type
UK: django update, use render() shortcut
UK: django update, use render() shortcut
UK: django update, use render() shortcut
UK: update requirements, django 1.6.x
PLD: remove extra =
PLD: uncomment savReaderWriter
UK: use restframework's base.html template
UK: set context to MetaDataSerializer