Convert absolute path of webfonts into relative one

So that it's possible to use a different URL for static assets.

oscar/static/oscar/css/dashboard.css

@@ -53,8 +53,8 @@
     */
 @font-face {
   font-family: 'FontAwesome';
-  src: url('/static/oscar/fonts/fontawesome-webfont.eot');
-  src: url('/static/oscar/fonts/fontawesome-webfont.eot?#iefix') format('embedded-opentype'), url('/static/oscar/fonts/fontawesome-webfont.woff') format('woff'), url('/static/oscar/fonts/fontawesome-webfont.ttf') format('truetype'), url('/static/oscar/fonts/fontawesome-webfont.svg#FontAwesome') format('svg');
+  src: url('../fonts/fontawesome-webfont.eot');
+  src: url('../fonts/fontawesome-webfont.eot?#iefix') format('embedded-opentype'), url('../fonts/fontawesome-webfont.woff') format('woff'), url('../fonts/fontawesome-webfont.ttf') format('truetype'), url('../fonts/fontawesome-webfont.svg#FontAwesome') format('svg');
   font-weight: normal;
   font-style: normal;
 }

oscar/static/oscar/css/styles.css

@@ -1967,8 +1967,8 @@ table th[class*="span"],
     */
 @font-face {
   font-family: 'FontAwesome';
-  src: url('/static/oscar/fonts/fontawesome-webfont.eot');
-  src: url('/static/oscar/fonts/fontawesome-webfont.eot?#iefix') format('embedded-opentype'), url('/static/oscar/fonts/fontawesome-webfont.woff') format('woff'), url('/static/oscar/fonts/fontawesome-webfont.ttf') format('truetype'), url('/static/oscar/fonts/fontawesome-webfont.svg#FontAwesome') format('svg');
+  src: url('../fonts/fontawesome-webfont.eot');
+  src: url('../fonts/fontawesome-webfont.eot?#iefix') format('embedded-opentype'), url('../fonts/fontawesome-webfont.woff') format('woff'), url('../fonts/fontawesome-webfont.ttf') format('truetype'), url('../fonts/fontawesome-webfont.svg#FontAwesome') format('svg');
   font-weight: normal;
   font-style: normal;
 }

oscar/static/oscar/less/font-awesome/font-awesome.less

@@ -22,7 +22,7 @@
 
     */
 
-@fontAwesomePath: '/static/oscar/fonts';
+@fontAwesomePath: '../fonts';
 
 @font-face {
   font-family: 'FontAwesome';

sites/demo/static/demo/css/dashboard.css

@@ -53,8 +53,11 @@
     */
 @font-face {
   font-family: 'FontAwesome';
-  src: url('/static/oscar/fonts/fontawesome-webfont.eot');
-  src: url('/static/oscar/fonts/fontawesome-webfont.eot?#iefix') format('embedded-opentype'), url('/static/oscar/fonts/fontawesome-webfont.woff') format('woff'), url('/static/oscar/fonts/fontawesome-webfont.ttf') format('truetype'), url('/static/oscar/fonts/fontawesome-webfont.svg#FontAwesome') format('svg');
+  src: url('../fonts/fontawesome-webfont.eot');
+  src: url('../fonts/fontawesome-webfont.eot?#iefix') format('embedded-opentype'),
+       url('../fonts/fontawesome-webfont.woff') format('woff'),
+       url('../fonts/fontawesome-webfont.ttf') format('truetype'),
+       url('../fonts/fontawesome-webfont.svg#FontAwesome') format('svg');
   font-weight: normal;
   font-style: normal;
 }