Extensions were added twice
Updated changelog
French start-installation.md (wip) [skip ci]
translated
translated
Adds twig lexerOptions to ViewRendererTest to demonstrate error
Fixes Twig lexerOptions throwing exception (#3877) and adds test for lexerOptions
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