docs/guide-ja/start-hello.md added [ci skip]
docs/guide-ja/README.md - adjusted the title of a chapter [ci skip]
Fixes #5570: `yii\bootstrap\Tabs` would throw an exception if `content` is not set for one of its `items`
Fixes #5572.
Fixes #5682: The `asset` command would incorrectly combine CSS files when `UrlManager::linkAssets` is true
Merge pull request #5691 from softark/docs-ja-2014-10-22

[ci skip] docs/guide-ja/start-hello.md added
Lost link
Merge pull request #5694 from pythagor/patch-3

[skip ci] Lost link
Fixes #3760: Gii model generator now imports classes when necessary instead of using fully qualified class names
fixed exception page to show error info that is longer than screen
change Console::confirm() output to use stdout
phpdoc improvements