More robust emergency contact solution

[zdmc23]

-- Offer the user more than just one emergency contact, but how many?

-- What if the emergency contact ignores the phone call; should we call again?

[http://github.com/dbul]

[zdmc23]

This should be included in the features list for paid customers; along with other features like multi-location/time check-ins, history of meetups, credibility: see others' history, etc...