TOC.
  I. Installing
    sudo gem install exposure
  II. REST
  III. Current Controller behavior with class methods
  IV. Exposure
    A. expose
    B. Finders
    C. Responders
    D. Flashers
    E. Callbacks
    
Controllers already have some configuration-like structure:
  before_filter
  after_filter
  around_filter
  
  skip_before_filter
  skip_after_filter
  skip_around_filter
  
  verify
  layout
  filter_parameter_logging
  rescue_from
  
We're adding
  expose
  find
  response_for
  flash_for
  
  the following callbacks:
    before_find
    after_find
    after_find_on_failure
    after_find_on_success
    before_assign
    after_assign
    before_save
    after_save
    after_save_on_failure
    after_save_on_success
    before_create
    after_create_on_failure
    after_create_on_success
    before_update
    after_update_on_failure
    after_update_on_success
    before_destroy
    after_destroy_on_success
    before_response
    before_response_on_success
    before_response_on_failure
  and speciality access to these callbacks with
    before
    after