Cleaner environments for yii2-advanced-app
Yet one optimization
removed getPostParam() from Request, body is $_POST by default

fixes #2093
adjusted changeloadjusted changelogg
fix the _only_ option in calls to FileHelper::findFiles()
Merge pull request #2188 from nineinchnick/2184-fix-findFiles

fix the _only_ option in calls to FileHelper::findFiles()
Fixes #2149: Added `yii\base\DynamicModel` to support ad-hoc data validation
updated classmap
added more tests.
fixed exclude paths in phpdoc command

fixes #2184
Merge branch 'master' of github.com:yiisoft/yii2

* 'master' of github.com:yiisoft/yii2:
  added more tests.
updated phpdoc properties
added missing use statement.
fixed potential problem about using unset variables.
CS fix.
Merge pull request #2181 from cebe/request-body-default-post-params

removed getPostParam() from Request, body is $_POST by default
Added `yii\web\Request::get($name = null, $defaultValue = null)` and `yii\web\Request::post($name = null, $defaultValue = null)`
Fixed an issue with Filehelper and not accessable directories

which resulted in endless loop

http://www.yiiframework.com/forum/index.php/topic/50982-cfilehelper-bug-security-flaw/
more clear docs about html options

fixes yiisoft/yii#2844
Fixes #2195
fixed possible problem with realpath and false value

realpath(false) = current working directory.
This can cause problems with getAlias() which returns false.

see yiisoft/yii#3113