using viewmodel->terminate() to check whenever view has layout
apply to on "render" to and remove unused JsonModel
changelog note for https://github.com/sitrunlab/LearnZF2/pull/89
Merge PR #89 from branch 'hotfix/viewmodel-terminate'

* hotfix/viewmodel-terminate:
  changelog note for https://github.com/sitrunlab/LearnZF2/pull/89
  apply to on "render" to and remove unused JsonModel
  using viewmodel->terminate() to check whenever view has layout