Changes on: confirm, warning, danger and success

Changes on: BootstrapDialog.confirm
- Added 2 Parameters: title (string) and buttons (array), now you can change te title of the dialog and the labels of the buttons.
Changes on: BootstrapDialog.warning, BootstrapDialog.danger and  BootstrapDialog.success
- Remove the argument callback that is unused.
- Add the argument title that allow to set a title for the dialog.