use ‘col-actions’ as default css class for index actions
this behaves like each other col
change modal dialog css for more than button
the old style keep the same, but no it works vor more than 2 buttons
Prevent active admin framework dialog styling from clobbering all jQuery UI dialogs.
Only namespace the destructive style change.

The other defaults seem like a good idea to apply globally.
Merge pull request #3169 from timoschilling/default_class_for_actions_col

use ‘col-actions’ as default css class for index actions
#3169 follow-up: selectable_column CSS class
Merge pull request #3168 from timoschilling/modal_dialog_css

change modal dialog css for more than button
Merge pull request #3174 from Squeegy/master

Prevent active admin from clobbering all jQuery UI dialog close buttons