Method 'yii\mail\MailerInterface::compose()' reworked allowing rendering message body.

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

- 'body()' renamed to 'renderBody()'
- new 'body()' method introduced

Method 'yii\mail\BaseMailer::compose()' updated, allowing composition of the complex methods like 'renderText' and 'body'.

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

- setter methods renamed to have pure name
- method 'createMessage' renamed to 'compose'

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...