include “our” hosted url  in OpenBadgeObjects json for assertions/badgeclasses/issuers uploaded to the backpack.
include “our” hosted url  in OpenBadgeObjects json for assertions/badgeclasses/issuers uploaded to the backpack.

includes some whitespace/comment cleanup of the .get_json() methods

refs BGR-1787

concentricsky/badgr-server,concentricsky/badgr-server