Added a debug toolbar panel for MongoDB
merge with upstream
Dynamic naming added to `DbPanel`
`MongoDbPanel` addition mentioned at CHANGELOG.md and README.md
`DbPanel` summary view fixed
Create russian translation for caching-fragment.md
Create Russian translation of Caching Http Guide
add note about tips/notes/warnings
edit intro and configuration
edit 'executing basic queries'
Italian translation of intro-upgrade-from-v1.md
prepare for next release.
Italian translation of start-installation.md
Fixes #5509.
Updated README [skip ci]
edit 'quoting table...'
edit 'prepared statements'
edit up to 'performing transactions'
Merge branch 'master' of https://github.com/yiisoft/yii2
guess the note blockquote will be live