Mailster - Email Newsletter Plugin for WordPress 4.0.8

-fixed: problem with slashes in head section during test campaign
-fixed: problem on template save
-fixed: display issue on color pickers in editor

added: optional caching parameter for forms
change: sanitize_content no longer uses stripslashes

* fixed: Double id on settings page
* fixed: conflict with some third party delivery plugins
* fixed: editor did not expand to correct height on some third party templates
* improved: Excerpt and Content of posts look the same no matter which type of embedding were used