#2417 Possibility to specify dataType for $.ajax call in yii.activeForm.js
Adding @since tag and changelog line
Removing @since tag
Merge pull request #2418 from yiiframework-com-ua/2417-active-form-ajax-data-type

PullRequest for #2417
Fixes #2083: make sure keys of object type work with ActionColumn, GridView, etc.
Removed unnecessary PHPDoc property (https://github.com/yiisoft/yii2/commit/ce04134db24d3bcdc0388f5b7832dd1dbb1945ef)
Merge pull request #2421 from yiiframework-com-ua/master

Removed unnecessary PHPDoc property
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.
Merge pull request #2422 from sarciszewski/patch-1

Inconsistently insecure
added back fallback mechanism for generating salt.
Added helpers.md
Fixed test break.
fixed test break.
minor doc improvement.
Fixed test break.