challenge 01-01-04-stupid-coaching (finished)

! modify interface.rb#main (futo run an infinite loop asking for input
  message, and calling #coach_answer
! modify coach_answer.rb#coach_answer (fully implement) to return an
  answer based on input message (what it wants to hear, a question and
  all the rest)
! modify coach_answer.rb#coach_answer_enhancef (fully implement) to
  prepend #coach_answer's answer with a satisfaction message if input
  message is shouting (capitalized) : as per test specs, prepends only
  for a question, or the rest, but not for what it wants to hear

Rubocop test : found 0 offenses
Rake test : passed 7/7 tests