Added "activeDataFile" parameter in hbs templates.

generators/block/templates/src/styles/template.scss

@@ -1,5 +1,5 @@
 /**
- * Use "rem" instead of pixels. 1rem = 16pixels
+ * Use "rem" instead of pixels. 1rem = <%= remToPx %>pixels
  *    No need to use rem in situations of "1px". (usually used for borders width).
  *
  * Use BEM naming system for class names: http://getbem.com/naming/
@@ -25,7 +25,7 @@
 
   &__visual {
     &-image {
-      // Example of BEM usage.
+
     }
   }