Update widgets/AuthAssignmentItemsColumn.php

When used in config/main.php:
'userNameColumn' => 'username', // the name of the user name column.
There was an error about property User.Name
Change this piece of code, prevents the error.
Merge pull request #44 from mve-it-solutions/patch-1

Fix a minor bug in AuthAssignmentItemsColumn
Check access to all module controllers
Added spanish messages file.
Merge pull request #50 from Yiivgeny/checkAccess-enhancements-2

Support check access to all module controllers.
Fix code formatting
Merge pull request #51 from robregonm/master

Added spanish messages
Merge pull request #4 from Crisu83/master

merge