Update widgets/TbEditableDetailView.php

solves https://github.com/clevertech/YiiBooster/issues/172
Merge pull request #174 from fleuryc/master

TbEditableDetailView : don't register Yii's base CSS
Create TbButtonGroupColumn

Extended TbButtonColumn to wrap the buttons in a button group. Adds a type ('info','warning' etc) to the buttons for ease of selection.
Renamed TbButtonGroupColumn to TbButtonGroupColumn.php
Merge pull request #222 from kanyuga/master

Enhancement: TbButtonGroupColumn / Love it