[Github] Merge public Github commits

[GoInc] Bug Fixes & Improve Change Risk Analysis and Predictions Metric

Change interpret() return value to conform with Layout\ReaderInterface

Change interpret() return value to conform with Layout\ReaderInterface (MAGETWO-32404)

Change interpret() return value to conform with Layout\ReaderInterface (MAGETWO-32404)

Small cleanup refactoring (MAGETWO-32404)

Change View\Layout\Reader\Remove::interpret() return value to conform
with Layout\ReaderInterface::interpret()

Change View\Layout\Reader\Move::interpret() return value to conform
with Layout\ReaderInterface::interpret()

* Fix typo in method name
* Change interpret  method return value to conform with Layout\ReaderInterface

MAGETWO-31723: Delete category message is absent after category has been deleted and a page has been loaded

- fix coding style violation
- update composer.lock

- MAGETWO-31970: Magento\Catalog\Block\Navigation::_renderCategoryMenuItemHtml
- revert invalid change in unit test

Conflicts:
	composer.lock

- MAGETWO-31970: Magento\Catalog\Block\Navigation::_renderCategoryMenuItemHtml

[Extensibility] Magetwo 30808 remove include path

[Extensibility] Magetwo 31776 add parent element theme

[API] MAGETWO-32105: Move api-functional tests from EE to CE

Prevent special characters finding their way into layout handle due to SKU being used (MAGETWO-32349)

[Github] Merge public Github commits, update CONTRIBUTING.md

- updated CONTRIBUTING.md
- removed unused images

Conflicts:
	dev/tests/integration/testsuite/Magento/Framework/Data/Form/Element/DateTest.php

Specify date fixture and fix expectations (MAGETWO-32328)

[Extensibility] MAGETWO-32328

* Fix date_format expectation for month part
* Make test independent of current time

- update composer.lock with "composer update symfony/yaml"

Naming Fix: DI compiler.php rename binary to igbinary to stay consistent (MAGETWO-32331)

MAGETWO-31051: M2 GitHub Update (version 0.42.0-beta2)