ISD response in create_camera is piped to nowhere

[jlaura]

https://github.com/USGS-Astrogeology/knoten/blob/master/knoten/csm.py#L42

This should take the response and (ideally) push the string into the ISD object. I believe that the ISD only takes a filename though, so no joy there. The func needs to take a filename as an arg and offer a default that can/will be overwritten.

[amystamile-usgs]

This is a pretty old issue, but I am confused on the purpose of create_camera. There is a create_csm function that returns the csm camera model. I think the only difference is the URL parameter, which I believe is no longer functioning (http://pfeffer.wr.usgs.gov/api/1.0/pds/).

So, my question is whether the create_camera function is necessary or if it can be removed.