Fixes #445 - Add integration with https://github.com/kartik-v/bootstrap-checkbox-x
Issue #445 - Add default and copy constructors
Issue #445 - Simplify the impl by using non-submitting behavior (AjaxEventBehavior)
Issue #445 - Update checkbox-x to 1.2.0 with a fix for https://github.com/kartik-v/bootstrap-checkbox-x/issues/3
Merge pull request #447 from l0rdn1kk0n/445-checkboxx

Fixes #445 - Add integration with https://github.com/kartik-v/bootstrap-...