add zendframework/zend-json to composer.json at Zend\ProgressBar\composer.json as require
moved zend-json from require to suggest
Merge branch 'hotfix/4722'

Close #4722
Merge branch 'fix.progressbar/composer.json' of git://github.com/samsonasik/zf2 into hotfix/4705
Merge branch 'hotfix/4705' into develop

Forward port #4705