Converter throws an error for variable values containing a relative path segment

[raphaelokon]

Hi there.
We just realised that from v1.0.3 upward the following Sass variables throw an error.

$FONT-PATH: '../fonts/fonts';

Changing the variable to $FONT-PATH: 'fonts/fonts'; makes the converter tests pass.

If I comment out those lines the tests pass as well → 08b7d2a?diff=split#diff-921da7a0583a1ad51be37f422ffa432aR135-R137