wp 3.8.1 compability


git-svn-id: http://svn.wp-plugins.org/qtranslate/trunk@845355 b8457f37-d9ea-0310-8a92-e5e31aec5664
2.5.39 release

git-svn-id: http://svn.wp-plugins.org/qtranslate/trunk@845820 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated to Wordpress 3.8
Updated readme.txt