Add RSR attributes to DB schema

Add the fields needed to represent the attributes under the akvo:
namespace in the database.
Change akvo: to akvo_ in schema definitions

Also remove dupe akvo:akvo: in a couple of places
Added Title and Description UI fields
Add Title and Description UI fields
Added akvo:type to <title> and <description> in Aidstream+ XML
Added 'aidstream-id' and Akvo fields on ParticipantOrg
Merged with 'hackaton' branch
Merge pull request #3 from openaid-IATI/rsr_customization

RSR customization