add missing return to module template

I think according to the framework it should return the render and otherwise the browser will stay blank...

module should extend \yii\base\Module as \yii\web\Module doesn't exist...

module should extend \yii\base\Module as \yii\web\Module doesn't exist...

If this is outdated, then pls just ignore it!

- cleanup API and usage, add documetation link
- introduced @property feature in getter or setter which has precedence
  over @return or @param tag if present

* 'master' of github.com:yiisoft/yii2:
  refactored code.

fixes #822

fixes #811

commit in redis branch was:
0cd65e74

Gridview and DataProviders: Autoconfig sorting

Blowfish cost must be in range 4…31, not 4…30

`generateSalt` parameter validation fix.