'ViewContext' interface extracted, files render workflow refactored to use this interface.
'ViewContext' renamed to 'ViewContextInterface'.
add sorting icons to gridview sort links in basic and advanced app css
minor code refacotring.
Fixes #1075: changed the default value of GridView::empty.
Fixes issue #1078: Typo in comment
Merge pull request #1079 from nukkumatti/master

Fixes issue #1078: Typo in comment
typo fix.
Update FallbackMessageFormatter.php

Fix declarations for yii\i18n\FallbackMessageFormatter::format() and yii\i18n\FallbackMessageFormatter::formatMessage()
Merge pull request #1083 from rosko/master

Update FallbackMessageFormatter.php
refactored message formatter
added unit test to verify AR afterSave isNewRecord value

closes #1084
ensure parameter types in baselistview message

fixes #1072
Merge branch 'master' into messageformatter-refactoring

* master:
  ensure parameter types in baselistview message
  added unit test to verify AR afterSave isNewRecord value
Merge branch 'master' of github.com:yiisoft/yii2 into email-swift-2
refactored MessageFormatter
fixed fallback message format parameter order
support integer number type in fallback message formatter
Add missing @throws PHPDoc declaration.
Merge pull request #1085 from cebe/messageformatter-refactoring

Messageformatter refactoring