Mailster - Email Newsletter Plugin for WordPress 4.0.8

* fixed: editbar position issue on Chrome 61
* fixed: background image not editable if its the first of the template
* improved: placeholder image handling
* improved: loading of user met values
* removed: deprecated jQuery methods

improved: translation checks and loading
improved: loading of translations
fixed: assigned unchecked lists on form submission if user choice is enabled
fixed: PHP warning on bounce handler
added: remove_custom_value method to remove meta values of subscribers
added: Mailgun delivery option to setup

• fixed: Editor button now only available in the backend
• fixed: Excerpts were missing when view mode is Excerpt View
• fixed: missing wp_get_raw_referer on WP < 4.5
• fixed: choosing default values for dropdowns and radio custom fields
• fixed: multiple attached attachments
• fixed: plain text option wasn’t respected during test campaigns
• improved: lists assigned to a form are now respected if form id is set explicitly on subscriber submission
• added: mailster_campaign_content filter to alter the content of campaigns
• added: mailster_using_permalinks filter