Add an option to generate entropy estimates.
Add an option to generate entropy estimates.

Teach daniel the -e option to make it generate an estimate of entropy in a
password generated with the given values.

Signed-off-by: brian m. carlson <738bdd359be778fee9f0fc4e2934ad72f436ceda@crustytoothpaste.net>

bk2204/daniel-ruby,bk2204/daniel-ruby