BaseInputFilter handles missing data properly

Previously BaseInputFilter::populate would pass a null value to setValue
this would cause the ArrayInput to throw an exception even if the
ArrayInput is not part of the validation group.

Something else that should be looked at is introducing a validator
instead of using a exception Zend\InputFilter\ArrayInput filter because
the exception will break the application if not managed correctly.
Added a test
Removed php 5.4 array notation
Added a assertation for the response phrase
Added a unit test
[Minor BC] Remove translation of validator keys

Removes the translation of validator message ***keys*** which is totally
absurd in the first place. They are constants that should not be
modified.
Removed the code retranslating messages
Removing the unit tests
Merge pull request #5666 from macnibblet/hotfix/remove-translations-in-formelementerrors

Remove translations in Zend\Form\View\Helper\FormElementErrors #5646
[#5666] Added note to readme

- This is technically a BC break, though it will likely affect nobody. Added
  note to release changelog.
Merge branch 'hotfix/5666' into develop

Close #5666
Fixes #5646
Merge pull request #5664 from macnibblet/hotfix/remove-validator-message-key-translation

[Minor BC] Remove translation of validator keys
[#5664] Added note to README

- Like #5666, this is technically a BC break and needs a note in the changelog.
Merge branch 'hotfix/5664' into develop

Close #5664
Merge pull request #5649 from macnibblet/feature/test-http-controller-reasons-phrase

Added a assertion method for the response phrase of a http response.
[#5649] Added note to readme

- new feature!
Merge branch 'feature/5649' into develop

Close #5649
Merge pull request #5638 from macnibblet/hotfix/baseinputfilter-population

BaseInputFilter handles missing data properly
Merge branch 'hotfix/5638' into develop

Close #5638