Adding a  option to \cli\prompt, a little bit buggy
Merge branch 'confirm' of github.com:igorsantos07/php-cli-tools

Conflicts:
	lib/cli/cli.php
Enabling clean hidden input

+ Added `Shell::hide()` that would use `stty` to hide terminal input/output
* hiding behaviour was moved from `prompt` to `input`
* dropped black background in place of `Shell::hide()`
Merging updates from master repository
Merge branch 'master' of https://github.com/wp-cli/php-cli-tools
Merge pull request #35 from igorsantos07/master

Adding a hiding option to \cli\prompt