Backslash in css urls when building on windows

[geleto]

Hello, there's a backslash in the css urls when building semantic-ui 2.2.2 on windows. In your css-only release this problem is not present, so I guess it's a windows-only issue:

src: url(".\themes/default/assets/fonts/icons.eot");
src: url(".\themes/default/assets/fonts/icons.eot?#iefix") format('embedded-opentype'), 
url(".\themes/default/assets/fonts/icons.woff2") format('woff2'), 
url(".\themes/default/assets/fonts/icons.woff") format('woff'),
url(".\themes/default/assets/fonts/icons.ttf") format('truetype'), 
url(".\themes/default/assets/fonts/icons.svg#icons") format('svg');

This messes up the resource loading in aurelia.

[jlukic]

This was fixed in 2.2.3 961b4c9

#4174