Compliance with the [WordPress PHP coding standards](http://make.wordpress.org/core/handbook/coding-standards/php/) - as tested with PHP_codesniffer.
Remove redundant .gitignore
Moved the initiation of the statics to just above the instantiation of the class within a function.
Oops... noticed that the minimum WP requirements hadn't been changed yet...
* Minor bugfix for internal domains option

* Minor typo in Dutch translation
* Tested for WP 3.6
* Upped version number
* Added changelog and upgrade notice for 3.1.4 version
Remove superfluous / in js and css urls
* Removed unnecessary passing of $this by reference
Fix for when update failed
Small bug fix
Make sure plugins_url() is used around all file links so the potentially hooked in filters will work
* Fix for upgrade routine not running on (re-)activation of the plugin

* Improved charset support for settings page
* Fully leverage the Options API

* Upped the minimum WP level to fully take advantage of new functions and APIs

*** There is a bug somewhere here when used as must-use! Needs fixing
Yet some more changes for the 3.2 version:

* Small CSS fix
* Small validation improvements
* Additional best practices
* Updated language files
Improved re-adding of default filters on add/update of options
Move loading of the textdomain and initial translation to the init action
The update_option hook was inadvertedly moved to the wrong place in WP 3.7, reverted in WP 3.7.1 - see [bug report 25705](http://core.trac.wordpress.org/ticket/25705).

Use the update_option hook if it is in the right place, otherwise abuse a filter
Documentation update
Add empty index.php files to all directories
Small fixes
Some more small tweaks

* Tested up to WP 3.8-beta
* Removed auto-deactivation
* Removed some backward compatibility for old WP versions
* Now using get_admin_page_title() and screen_icon()
* Move creating of table row with select box to separate method