v0.0.1 2014-11-06; first cut.

• Initial implementation;

  aws-keychain add <access_key_id> <secret_access_key>
  aws-keychain cat
  aws-keychain env
  aws-keychain ls
  aws-keychain none
  aws-keychain rm
  aws-keychain status
  aws-keychain use
  eval aws-keychain env <name>