File Validators refactored
File validator tests fixed
New File Filter RenameUpload for securely moving uploaded files
Refactored Zend/File/Transfer/Adapter/Http upload progress methods into Zend/Progressbar/Upload/UploadHandlers
New Form Elements for File Upload Progress tracking
Unit tests for new Zend/Form/Element/File elements
Unit test coverage for InputFilter, File Element, and FormFile view helper changes
Unit test for AbstractUploadHandler
Removed Zend/File/Transfer and tests
Fix for HTML5 multiple attribute on file element
Added bullet points to Changelog for File Upload rewrite
[Code] Add support for @throws, multiple types and typed arrays
fix cs in FormCollection-helper
added test for custom fieldset helper use in formcollection helper
Fixes #2745.
Merge branch 'hotfix/2867' into develop

Forward port #2867
Adding hasUnknown and getUnknown methods to detect and get unknown inputs
Merge pull request #2873 branch 'hotfix/add-missing-throws-tags'
Merge pull request #2871 branch 'hotfix/change-logical-operator'
Memcached:
 - fixed some small issues on sharing memcached resources over different instances of Zend\Cache\Storage\Adapter\Memcached
   - implemented namespace support manually to not change Memcached::OPT_PREFIX_KEY on a memcached resource
   - added Zend\Cache\Storage\Adapter\MemcachedResourceManager that handles memcached resources
 - removed the default server configuration (127.0.0.1:11211)
 - added an option to create persistent connections "persistent_id"