Added alternative way of setting up dev environment.

implementation checks for instanceof for additional swiftmailer
capabilities.

issue #2870

controller links application vendor to yiidev repo

Didn’t make any sense, particularly after the browser stuff. If kept,
I’d move it behind the other command-line reference.

Bugfix/date normalize

Fix call to AssetConverter::convert() in AssetBundle

Update Response.php

$_SERVER['SERVER_PROTOCOL'] returns 'HTTP/1.0' or 'HTTP/1.1'

use tableprefix on gii model generator

Just fixing small misspelling

Small misspelling

removed unused code $patterns

useTablePefix => useTablePrefix

use tableprefix on gii model generator

Update AutoloadExample.php

typo fix

[ci skip]

* 'master' of github.com:yiisoft/yii2:
  Refactored filter error display for GridView.
  Fixes #3008: Added `Html::errorSummary()`