adjust directories for PSR-4.
psr-4 change.
psr-4 change.
psr-4 move
path fixes.
adjusted codeception composer.json
zh-cn add

zh-cn add
added missing use statement.
moved zh-CN directory.
Merge pull request #1898 from djfly/patch-1

zh-cn add
typo fix [skip ci]
Merge branch 'master' of github.com:yiisoft/yii2
reordered language code [skip ci]
[IMPORTANT] Path corrections
Fix phpdoc generation in gii model generator.
Serbian translation. Fixes #1907
Merge pull request #1902 from creocoder/path-corrections

[IMPORTANT] Path corrections
Merge pull request #1903 from BelalWM/master

Fix phpdoc generation in gii model generator.
Fixes #1909
Fixes #1900.