fixed code-style
added `yiisoft/yii2-coding-standards` to yii2-dev suggested packages

issue yiisoft/yii2-coding-standards#4
typo in composer.json
Fixes #2341, fixes #2317: moved codeception dependecies to "suggest" section, fixed codeception version on stable branch
Updated readme in apps/basic/tests
Merge pull request #2350 from schmunk42/feature/toolbar-ui-2

Feature/toolbar ui 2
Fixed list in tests readme
Reverted numbered list
Reordered items
doc fix.
Merge branch 'master' of git://github.com/yiisoft/yii2
Updated the page

need to confirm the exception properties in Yii 2
Fixed suggest descriptions
Fixed travis config syntax
Fixed directory in travis
Fixes #2361: `yii\bootstrap\NavBar::brandUrl` should default to the home URL of application
Fixes #2054: Added support for using custom application configuration with the console command runner
Update error.md

typo fix
Merge pull request #2366 from dizews/patch-1

Update error.md
fixed BaseMailer test to work on APC and HHVM