Forward port zendframework#2687

Forward port zendframework#2698

Forward port zendframework#2699

Forward port zendframework#2700

CS space & returning instance

Add service & add tests

…slager/zf2 into functionality/WriterPluginManager

Changed writers according to that

Forward port zendframework#2716

- Aligning operators
- Assuring changes work with current develop branch

Close zendframework#2848

…mensSahs/zf2 into feature/2855

- Added a test for the renderer.post event to ensure it gets triggered

Close zendframework#2855

Forward port zendframework#2872

- Provides hasUnknown and getUnknown
- BaseInputFilter now implements this additional interface

Close zendframework#2875

- The block that handled exceptions in DefaultRenderingStrategy was
  calling trigger() on the event object -- clearly a problem. Code has
  been modified to retrieve the event manager from the application
  object composed in the event, and trigger from there.
- Additionally, a potential infinite loop was removed (the render event
  was getting triggered a second time from within the catch clause)
- Tests added to ensure that the render.error event is now properly
  triggered.

[zendframework#2964] Retrieve application events before triggering

Conflicts:
	library/Zend/File/Transfer/Adapter/AbstractAdapter.php
	library/Zend/Validator/File/ExcludeExtension.php
	library/Zend/Validator/File/ImageSize.php
	library/Zend/Validator/File/NotExists.php

…service-factory

LoggerServiceFactory does not return a logger

Revise MongoDB session save handler's gc() docs

Forward port zendframework#2670

…velop