Merge pull request #92 from ckeditor/t/70
Fix: Tooltips for disabled buttons should not be dimmed. Closes #70.
BREAKING CHANGE: `.ck-disabled` is no longer available as a standalone class due to differences in the implementation of the disabled state among the UI components. Use a mixin instead `.your-class.ck-disabled { @include ck-disabled; }` to keep the previous functionality (reduced `opacity`) or provide a custom implementation of the state.