Nag users to update their details
Merge pull request #1 from ernesto-jimenez/nagging

Nag users to update their details
Fix bug where we did not get the name
Don't process whois messages unless HUBOT_WHOIS_SP is defined
Whois improvements

  * hubot replies to the person asking
  * Check if a user exits when in doubt
  * Remove the exists flag if a user used to have info but no longer does
Reset nagging when user no longer has details