New function to arrange contributors

[sannegovaert]

Everybody with a certain role for a project on Agouti becomes automatically a contributor in the exported camtrap DP.
A function to arrange the contributors could thus be useful. I think adding contributors happens best at Agouti.

arrange_contributors(x, c("Tim Adriaens", "Peter Desmet", Sanne Govaert"))

This would work if all necessary information is provided by the user (in their Agouti account setttings).
I am not sure if this function should allow to update/add contact information.