Use hashed path for IDs in SVG sprites

Fix #74

Author: vvasilev-

src/core.js

@@ -61,7 +61,7 @@ export const defaults = {
 		shape: {
 			id: {
 				generator(name, file) {
-					return file.path;
+					return new Buffer(file.path).toString('base64');
 				}
 			}
 		},

src/factories/vector.js

@@ -31,8 +31,9 @@ export default function run(opts, images) {
 			height: data.css.spriteHeight
 		};
 
+
 		data.css.shapes.forEach((shape) => {
-			spritesheet.coordinates[shape.name] = {
+			spritesheet.coordinates[new Buffer(shape.name, 'base64').toString()] = {
 				width: shape.width.outer,
 				height: shape.height.outer,
 				x: shape.position.absolute.x,