Stroke SVGs in sprite

[TeemuSuoranta]

Currently SVGs with strokes are not automatically handeled correctly by sprite as fill is applied in CSS regardless of SVG structure.

You can make svg specific fix in CSS with:

fill: none;
stroke: #000;
stroke-width: 1;

For better solution there could be a step in gulp process that migrates strokes into fills and thus makes all svgs work the same. Look into implementing: https://github.com/oslllo/svg-fixer