Start-workflow added
Extensions were added twice
sql view mapping added , similar to CQRS query model
fixed notes and guide
Updated changelog
Gii generator for MongoDB Active Record created.
Docs about MongoDB gii generator usage added
mimeTypes Validator is wrong

I'm find error

```php

Wrong
 } elseif (!empty($this->mimeTypes) && !in_array(FileHelper::getMimeType($file->tempName), $this->mimeTypes, true)) {

Correct
} elseif (!empty($this->mimeTypes) && !in_array(FileHelper::getMimeType($file), $this->mimeTypes, true)) {
```

Not need call '$file->tempName' because getMimeType get object $_FILE => $file, so use $file and validator works fine
Update FileValidator.php
Fixes #2314: Gii model generator does not generate correct relation type in some special case
Merge pull request #3785 from marciocamello/patch-2

mimeTypes Validator is wrong
Merge pull request #3778 from klimov-paul/mongodb-gii

Enh: MongoDB model gii generator
Fixes issue #3740 for horizontal layouts
fixed mime type file info
Doc comments and code style for 'debug' extension adjusted
Merge pull request #3789 from mikehaertl/master

Fixes issue #3740 for horizontal layouts
Fixed translation tool and docs
Added notes about composer to translation docs
Fixed translation docs typo
Removed unnecessary symlink