Fixes #1186: Changed `Sort` to use comma to separate multiple sort fields and use negative sign to indicate descending sort

Fixes #2295: basic app description now doesn't insist it is for websites containing mainly informational pages since it was misleading

#2436 receive label of the attribute from related model

added yii console command to tests

Minor typo

Fix for multiple $.ajax calls with "JSONP" dataType

#2436 override the function `getAttributeLabel` in `BaseActiveRecord` to receive label of the attribute, which looks like `relatedMode.attribute`, from the related model

#2436 override the function `getAttributeLabel` in `BaseActiveRecord` to receive label of the attribute, which looks like `relatedMode.attribute`, from the related model

#2436 override the function `getAttributeLabel` in `BaseActiveRecord` to receive label of the attribute, which looks like `relatedMode.attribute`, from the related model

Debug module mail improvements

Mistype fix

Tests improved

Inconsistently insecure

Why use a strong random number generator in one place, but not another? I know salts have no cryptographic security requirement, but collisions are less likely if you use one.

Removed unnecessary PHPDoc property

Removed unnecessary PHPDoc property (https://github.com/yiisoft/yii2/commit/ce04134db24d3bcdc0388f5b7832dd1dbb1945ef)