@mixin hide-text {
  line-height: 1.5;
  overflow: hidden;

  &:before {
    content: "";
    display: block;
    width: 0;
    height: 100%;
  }
}

@mixin hide-text($height: 1em) {
  height: $height;
  line-height: 1.5;
  overflow: hidden;

  &::before {
    content: "";
    display: block;
    width: 0;
    height: 100%;
  }
}

Allow hide-text addon to accept height argument
Allow hide-text addon to accept height argument

- Fixes #551
