Author: Rossiani Wijaya
MDL-43861: Atto Plugins: create new plugin for font and background colors
http://git.moodle.org/gw?p=moodle.git;a=commit;h=534cf7b730822d098ef8ced27bbcf0039efae738
http://github.com/moodle/moodle/commit/534cf7b730822d098ef8ced27bbcf0039efae738
+ 2.7 en [pluginname,atto_backcolor]
+ 2.7 en [pluginname,atto_fontcolor]