Change inactive submenu items from white to a mix of the base color (to mimic opacity);
Update/comment bubble color should change on hover/select, to avoid clashing the bright 
bubble color with the highlight color.


git-svn-id: https://plugins.svn.wordpress.org/mp6/trunk@765908 b8457f37-d9ea-0310-8a92-e5e31aec5664
Darken inactive submenu to 30% mix (http://sass-lang.com/docs/yardoc/Sass/Script/Functions.html#mix-instance_method)


git-svn-id: https://plugins.svn.wordpress.org/mp6/trunk@765913 b8457f37-d9ea-0310-8a92-e5e31aec5664