User settable key expiration

[blakeca00]

As a default, keyup shows the the key age in RED when it is 30+ days old.

This should be configurable when setting options for keyup via:

$ keyup --configure

After setting this value, keyup should only render key age in RED when exceeding the user settable value. There should be a maximum time windows allowed (say 1 year)

[blakeca00]

Resolved, version 1.0.4