[#370] Add photo credit when loading Cordaid iati activities
[#370] Add photo credit when loading Cordaid iati activities

Use the akvo:image-by attribute to get the photo credit for project
images.

Note: akvo:image-by should be changed to akvo:photo-credit.

akvo/akvo-rsr,akvo/akvo-rsr,akvo/akvo-rsr,akvo/akvo-rsr