Added type parameter (-t)

[hborders]

I also bumped the version. I only tested private-key since that's all I needed, but the code is simple enough that I think it should work for the rest.

[n8felton]

This appears to be working for me, specifically the -t private-key part that I would love to see in master. Pinging @torsten to see if this can be merged and closed out.