update to MonkeySpec:

- i took the liberty to reapportion some of the monkey names to
  new/different components.  some components are no longer needed
  (eg. marmoset as originally defined is no longer needed since rhesus
  handles both ssh key file types).  i also took the name "howler" and
  used it for a new component that generates and publishes server gpg
  keys.
- fleshed out the Alice/Bob use case senario with some clarification
  and more detail.