Enable insfactor.el for cider

Hello Mr. John Hume,

I write to you today to request that you joyfully receive this hackity hack which enables insfactor.el on cider-based configurations. In time, I expect this will become unnecessary as the elisp government settles on a final name for this goddamn thing. In the meantime, I would very much like to use your tool. I think it is nifty.

Warm thanks and regards,
Steven Deobald The First.