Added Dns detail views

As mention in https://github.com/OSU-Net/cyder/issues/85 .
Can now view objects by "objectname/pk".
https://github.com/OSU-Net/cyder/pull/57 is dependant on this being merged.
Still needs to run full tests just in case.
After the SOA detail view was implemented, https://github.com/OSU-Net/cyder/issues/99 came up.