Update spritesheet.js to use custom scale template

Author: johnshaughnessy

package-lock.json

@@ -24,7 +24,7 @@
     "test": "npm run lint && npm run test:unit && npm run build",
     "test:unit": "ava",
     "stats": "rimraf ./dist && webpack --mode=production --json",
-    "spritesheet": "spritesheet-js -f css-modules -p src/assets/images/spritesheets/ --padding 4 --divisibleByTwo -n css-spritesheet src/assets/images/css-sprites/* && spritesheet-js -f json -p src/assets/images/spritesheets/ --padding 8 --divisibleByTwo -n sprite-system-spritesheet --powerOfTwo src/assets/images/sprites/*"
+    "spritesheet": "spritesheet-js -f custom-scale-css-modules -p src/assets/images/spritesheets/ --padding 4 --divisibleByTwo -n css-spritesheet src/assets/images/css-sprites/* --customScaleMatch mic --customHeight 40 --customWidth 40 && spritesheet-js -f json -p src/assets/images/spritesheets/ --padding 8 --divisibleByTwo -n sprite-system-spritesheet --powerOfTwo src/assets/images/sprites/*"
   },
   "ava": {
     "files": [