Merge pull request #194 from robregonm/master

Added BootstrapFilter class in order to load Bootstrap component on specific actions
Fixed the empty table bug.
re #178 #198
Merge pull request #201 from hijarian/master

Fix for the empty table keys bug
Fix according to #223

As specified in #223, changed declaration of `preFilter` to the one compatible with `CFilter`'s one.
Update actions/TbToggleAction.php

No need to save all model attributes, while only one is changed.
Merge pull request #267 from MadAnd/patch-1

Update actions/TbToggleAction.php
Added visible option to TbButton for easy hiding / unhiding
Merge pull request #274 from jonmixnblend/master

Visibility property for TbButton