Remove Version requirement from Feed

- Adds Zend\Feed\Writer\Version and Zend\Feed\PubSubHubbub\Version, replacing
  the external Zend\Version requirement
Remove hard dependency on ServiceManager in Feed

- Created Zend\Feed\Reader\ExtensionManagerInterface and
  Zend\Feed\Writer\ExtensionManagerInterface. Default ExtensionManager
  implementations implement these while extending AbstractPluginManager.
- You can implement the interface and inject your implementation as the default
  ExtensionManager if desired.
Use decorator pattern

- PHP 5.3.3 does not like it when you implement multiple interfaces that define
  the same method, even if the signatures are identical.
- Workaround is to implement a decorator.
Same thing for Writer

- Make ExtensionManager a decorator
Rename service to "MvcTranslator"

- Removes conflict with ZendSkeletonApplication, which defines a "translator"
  service already.
Update service name when mocking

- s/translator/MvcTranslator/
Removed Uri dependency from Feed

- Implemented Zend\Feed\Uri, a stripped down version of Zend\Uri\Uri that
  performs only validation and acts as a value object.
- Updated all Feed subcomponents to use Zend\Feed\Uri.
- Removed zendframework/zend-uri from dependencies.
Update dependencies

- Add Validator as a required dependency
- Add Http as an optional dependency
Created new importRemoteFeed() method

- accepts a URI, and an HTTP client instance
- Defined new component-specific interfaces for HTTP client and HTTP response
  objects
- unit tests to validate that it works
CS fixes

- per php-cs-fixer
update Zend\Mvc\Application::bootstrap
Merge pull request #4432 from samsonasik/update/codeconcistency

code concistency : update Zend\Mvc\Application::bootstrap
Merge branch 'hotfix/4432'

Close #4432
Merge branch 'hotfix/feed-version-dependency-removal'

Close #4392
Merge branch 'feature/feed-segregated-manager-interface'

Close #4396

Conflicts:
	library/Zend/Feed/composer.json
Merge branch 'hotfix/validator-service-compat'

Close #4410
Merge branch 'feature/feed-dependency-removal'

Close #4415

Conflicts:
	library/Zend/Feed/PubSubHubbub/Publisher.php
	library/Zend/Feed/PubSubHubbub/Subscriber.php
	library/Zend/Feed/Writer/Renderer/Feed/Rss.php
	library/Zend/Feed/composer.json
2.2.0rc2 readiness

- Updated changelog, version, and readme with changes since rc1
Merge branch 'releases/2.2.0rc2'

2.2.0rc2 readiness
Bump version

- Back to dev