sql view mapping added , similar to CQRS query model
fixed notes and guide
fixed mime type file info
Merge pull request #3776 from Ragazzo/sql_view_widgets_added

sql view mapping added , similar to CQRS query model
Merge pull request #3791 from Ragazzo/fix_bugfix_on_mime_types

fixed mime type file info
Merge branch 'master' of https://github.com/yiisoft/yii2