add apiOptions.spritesheet_info;

[iam2r]

sometimes one file need to import more CSS pre-processor data; to avoid variable name conflicts, should use api.spritesheet_info;

• spritesheet_info Object - Optional container for metadata about spritesheet and its representation
  • name String - Prefix to use for all spritesheet variables
    • For example, icons will generate $icons-width/$icons-image/etc in a SCSS template
    • By default, this is spritesheet (e.g. $spritesheet-width, $spritesheet-image)