the `options` accessor here is a hack to log the CLI [options on the templates](https://github.com/lucasmazza/spriteful/blob/4d2361917115a48c44b1b59bbfa8ad024edc0043/lib/spriteful/stylesheets/template.css.erb#L4). I would rather pass down a `optimize` boolean down the objects into the `Image` object `initialize` method for this.