[SK] Added translation.
Merge pull request #1916 from lubosdz/master

[SK] Added translation.
added docs about query caching. fixes #1917
removed hard dependency on codeception from codeception extension

no need to download codeception via composer when phar is used.
fixes #1913
use symlinks instead of hardlinks to make __FILE__ work

fixes #1606
proper handling of JsonSerializable.
typo
Translation for Portuguese (pt-PT, Portugal).
Adapted from Portuguese Brazilian translation.
refactored Json helper.
updated class map
added CHANGELOG line for PSR4 directory move
fixed phpdoc command.
fixed Markdown::process() to make it compatible with parent declaration.
Merge branch 'master' of github.com:yiisoft/yii2
Merge remote-tracking branch 'upstream/master'
Fixed typo in "items" translation.
Merge pull request #1919 from JoniDS/master

Translation for Portuguese (pt-PT, Portugal).
Fixes #1894: The path aliases `@webroot` and `@web` are now available right after the application is initialized
fixed test break.
update extensions.md, Namespace section

Make clear that "type" in extensions' namespaces must be in plural form (widgets/behaviors/modules)
fixed invalid upstream url