GET
/projects/{project_id}/keys.xml
=> Returns a list of keys
GET
/projects/{project_id}/keys/12.xml
=> Returns a key
PUT
/projects/{project_id}/keys/12.xml
=> Supply with attribute params, updates the key
POST
/projects/{project_id}/keys
=> Supply with attribute params, creates a key
DELETE
/projects/{project_id}/keys/{key_id}.xml
=> Deletes a key