Fixed compatilibity problems with wordpress 3.9 using TinyMCE4 (plugin is no longer backwards compatible)

git-svn-id: https://plugins.svn.wordpress.org/bolcom-partnerprogramma-wordpress-plugin/trunk@906879 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated readme.txt for wordpress version information

git-svn-id: https://plugins.svn.wordpress.org/bolcom-partnerprogramma-wordpress-plugin/trunk@906882 b8457f37-d9ea-0310-8a92-e5e31aec5664