Storagetype framework / generic reference field

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Dockit should have a field that can reference either a dockit document or a django model. The value of the field could specify a protocol followed by a protocol specific identifier (ie django://auth.user.1 or dockit://team.member.1). To facilitate this a storagetype framework could be constructed that would allow for the registration of various storage types. The framework could also offer some hints on how to do common interactions with the storage type (get, delete, list, etc) which could allow for more generic interfaces to be constructed.