add command flag parser

This is a small command flag parser hacked away in a couple hours. It is
built after cobra (https://github.com/spf13/cobra), but with some small
details changed.
Instead of breaking with the go flag API (single and double dashes) this
uses the golang flags package. This means, that single character flags
do not work, but in this case it wouldn't make much sense to replace
long clear argument names with short nothing saying arguments (-p for
--private-key or --public-key?).

This should definitely help with the help and error messages.

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