French start-installation.md (wip) [skip ci]
intro upgrade from v1 guide translated
fixed installation header
Create caching-page.md

Translate "Page Caching"
Fix typo [skip ci]
use different file names in tests to ensure they can run on HHVM
French start-installation.md [skip ci]
French images copy [skip ci]
use different file names in different tests to run on HHVM
Unnecessary full class name usage removed
Merge branch 'master' of github.com:yiisoft/yii2
Remove production word [skip ci]
French start-installation.md [skip ci]
Merge pull request #3895 from klevron/temp

Fix typo in start-installation.md
skip tests on HHVM
Finish French start-installation.md [skip ci]
Merge pull request #3894 from klevron/start-installation

French start-installation.md
Merge pull request #3883 from dementorpasha/patch-1

Create caching-page.md
Merge pull request #3881 from Ragazzo/intro_upgrade_translated

intro upgrade from v1 guide translated
Added HHVM badge to README

[ci skip]