Fix: Calling count() results in infinite loop
Zend\Db
- fix composer to reflect stdlib is suggested, not required
Test added for count() in KeyListIterator
Merge branch 'master' of git://github.com/bramstroker/zf2 into hotfix/3562
Merge branch 'hotfix/3562'

Close #3562
Merge branch 'hotfix/db-composerfix' of git://github.com/ralphschindler/zf2 into hotfix/3563
Merge branch 'hotfix/3563'

Close #3563