[Nitro] OgAdminController fixes, SessionData size

[Robert Mela]

1) OgAdminController#save was throwing an exception that nil.NilClass 
has no [] method...

I fixed it by changing all instance of this

    request['object_class_name']

to this

  request.post_params['object_class_name']

Is this worth a patch, or is the og admin part no longer used?

2) I'm getting a webrick internal server error with the message " 
Session data size exceeds the cookie size limit"  How do I use a 
database for session store?  I s'pose I could dig for it in the code...

thx.
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