[#3055] Remove array to string conversion notice

- Removes an array to string conversion notice when nested arrays are
  provided as values
removed "self" typehints in Zend\Config and Zend\Mvc
Merge branch 'hotfix/3499'

Close #3499
Fixes #2977
Merge commit 'refs/pull/3484/head' of github.com:zendframework/zf2 into hotfix/array-to-string-conversion
Merge pull request #3484 branch 'hotfix/array-to-string-conversion'
Merge branch 'master' of https://github.com/zendframework/zf2