Revert "Added ActiveForm::mfield()."

This reverts commit 9a5ca9951318447d050e5d53b05c0c281667b1a5.
Add spaceless widget.
PHPDoc Markdown newlines before code blocks added.
Merge pull request #560 from resurtm/spaceless-widget

Add spaceless widget.
Console application has to exit with exitCode

fixes #562
Change validators from 'length' to 'string'
Merge pull request #564 from FrediL/master

Change validators from 'length' to 'string'
Added default value for error in Model::addError().
Converted CRLF to LF. Added gitattributes file.
ActiveRecord::setAttribute() bugfix
ActiveRecord::setOldAttribute() bugfix
Merge pull request #576 from creocoder/ar-set-attribute

ActiveRecord::setAttribute() bugfix
Added acceptance tests for the basic app.
Merge branch 'master' of github.com:yiisoft/yii2
Forcedly set file type by extension.
Adjust for test integration.
Merge pull request #573 from bio/normalize-repo

Converted CRLF to LF. Added gitattributes file.
Added functional tests for the basic app.
Merge branch 'master' of github.com:yiisoft/yii2
Proposed mutex extension.