Interpolation in properties

[sandrojohanides]

Couple of problems with this:

• the #{nth()} interpolation color with the function inside
• the - hyphen color after and before the interpolation
• the - minus and / divide color in value after interpolation

    #{nth($dirs, 1)}: 100%; // `bottom: 100%` by default
    #{nth($dirs, 2)}: $offset; // `left: 50%` by default

    height: 0;
    width: 0;
    margin: auto;
    margin-#{nth($dirs, 2)}: (-$size / 2);

    border: solid transparent;
    border-#{nth($dirs, 1)}-color: $color;
    border-width: ($size / 2);

[braver]

Right now it only supports interpolation of variables, not of full expressions. So, this issue is correct and support for sass script expressions should be added here. Thanks!

[braver]

closed via #96