Fixed "selected" not disappearing when clicking another segment on CurrentSegmentInfobox + added a selected state to AnnotationsController buttons to reflect AnnotationsList/CreateAnnotation shown/hidden state

// Opacity

.opacity(@opacity) {
  opacity: @opacity;
  // IE8 filter
  @opacity-ie: (@opacity * 100);
  filter: ~"alpha(opacity=@{opacity-ie})";
}