Proposal for accessing populated relations

[ci skip]

Modified application templates so when trying to log in when already logged in it just redirects to homepage instead of throwing exceptions

Refactored View

* 'master' of github.com:yiisoft/yii2:
  Fix typo

related to #1151

Fixed typo

* 'master' of github.com:yiisoft/yii2:
  Fixes #1146: Gii generates wrong relation.

fixes #1146

not needed when installed via composer and application config loads
composer extensions correctly

set alias to the correct path as they are not part of the yii framework
directory anymore

issue #1140

now also gets stderr output.

fixes #1140

Proposal for #827 Add ImageValidator

Little explanation on the IP whitelisting

I wasted >1h trying to find out why the debug bar was not shown on my remote staging server. Hopefully this will help other people avoid this mistake...

Fixes #1133: gii controller generator now uses application controllerNamespace as default value for "Controller Namespace"

* 'master' of github.com:yiisoft/yii2:
  doc fix
  Fixes #1134: doc fix.