Updated to version 1.4.5.

* Fixed an issue with copy content.
* Improved handling of styles in prebuilt layouts.
* Improved error handling in Javascript.
* Fixed issue with checkboxes.

git-svn-id: https://plugins.svn.wordpress.org/siteorigin-panels/trunk@853042 b8457f37-d9ea-0310-8a92-e5e31aec5664