Revert "Use latest ES version for fix tests"

close #5664
skip APC on travis as it currently breaks composer
added test for #5962
Update .travis.yml

print elasticsearch version
docs/guide-ja/README.md - fix for a deleted section [ci skip]
docs/guide-ja/start-looking-ahead.md - fixed markdown syntax error [ci skip]
docs/guide-ja/structure-widgets.md - prepared for translation [ci skip]
docs/guide-ja/structure-widgets.md - WIP [ci skip]
docs/guide-ja/structure-widgets.md - WIP [ci skip]
docs/guide-ja/structure-widgets.md - completed [ci skip]
Merge pull request #5989 from softark/docs-guide-ja-2014-11-10

docs/guide-ja/structure-widgets.md added [ci skip]
Fixed typos in Russian translation of tutorial-advanced-app.md
Fixed broken links [ci skip]
`yii\log\Logger::flush()` updated to reset messages before passing them to the dispatcher.
Fixes #5997: The same message may be exported twice to log targets
Fixes #5938: add sentence method in Arrayhelper for convert the array to a comma-separated sentence
fix camelCase syntax
add tests for sentence method
dropped locale option
fix docs