Story/GECO-140: Adding deletion endpoint to the V2 API

[diya17]

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https://diging.atlassian.net/browse/GECO-140

Anything else the reviewer needs to know?

Depends on
#113
diging/giles-eco-requests#18
diging/giles-eco-nepomuk#30
#109

[diging-jenkins]

Can one of the admins verify this patch?

[jdamerow]

that should return an ok status and a url to poll to get the status of the deletion process.

[jdamerow]

Resolve conflicts please