Aqui todo o processo que consegui fazer fazendo o upload do zftool.
C:\xampp\htdocs\estoque\skeleton-application>composer require zendframework/zfto
ol:dev-master
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
  - Installing zendframework/zend-json (2.6.1)
    Loading from cache
  - Installing zendframework/zend-version (2.5.1)
    Loading from cache
  - Installing psr/log (1.0.1)
    Loading from cache
  - Installing zendframework/zend-log (2.9.1)
    Loading from cache
  Please select which config file you wish to inject 'Zend\Log' into:
  [0] Do not inject
  [1] config/modules.config.php
  [2] config/development.config.php.dist
  Make your selection (default is 0):
Qual é a orientação quando chego nesta permissão, alguém já teve esse problema ?