Merge branch 'hotfix/4808'

Close #4808
Merge branch 'hotfix/4808' into develop

Forward port #4808
Better test for PHP version

- version_compare understands comparing minor versions, fortunately;
  fixes issue with bad comparisons in 5.5 vs 5.4.
Merge pull request #4813 from qapa/zend-log-filter-sample

Zend log filter sample
[#4813] remove underscore

- no longer underscore-prefixing non-public properties
Merge branch 'feature/4813' into develop

Close #4813
Merge pull request #4815 from qapa/#4563

Make HTTP auth adapter's challengeClient() method public
[#4815] Better error message

- Ensure the message indicate the method being invoked, and the
  fully-qualified method name of the replacement.
Merge branch 'feature/4815' into develop

Close #4815
Merge pull request #4822 from froschdesign/hotfix/zend-tag-cloud

Simplification of the HTML class name in Tag\Cloud\Decorator\HtmlCloud
[#4822] CS

- If we're going to make readability changes, let's make them consistent
  with the rest of the framework:
  - array arguments should all have commas following each entry
  - array arguments as sole argument of a method can open on same line
    as call; indentation then adjusts one level less
- Use `assertInstanceOf` throughout, instead of `assertTrue($a instanceof $b)`
- While the `setExpectedException()` lines get a little long, they're
  not unreadable; breaking them into multiple lines makes intent less
  clear.
Merge branch 'feature/4822' into develop

Close #4822
Little fix in InputFilter/Factory

Hi there!

We can now add error_message option to Input without fallback which caused problems with validation final result.
[#4838] Added test

- Added test to ensure that change works
Merge branch 'hotfix/4838'

Close #4838
Merge branch 'hotfix/4838' into develop

Forward port #4838
Merge pull request #4850 from trueaxiom/issue4802

Allow form elements created via Annotations to have same default InputFilter as created via array specification
Merge branch 'hotfix/4850'

Close #4850
Merge branch 'hotfix/4850' into develop

Forward port #4850
Better test for PHP version

- version_compare understands comparing minor versions, fortunately;
  fixes issue with bad comparisons in 5.5 vs 5.4.