Merge pull request #43 from Murrx/master

Added basic endpoints for region, country, organisation and sector
Merge pull request #44 from Murrx/PR-api-root

Added simple root endpoint to the API
Merge pull request #45 from Murrx/PR-related-data

Added basic string repressentation of reverse related data for all serializers
removed some comments
Merge pull request #47 from Murrx/PR-activitysectors

added activitysectors endpoint
Merge branch 'develop' of https://github.com/openaid-IATI/OIPA

Conflicts:
	OIPA/api/activity/serializers.py