code: function dummyImgSrc (width, height, options) {
    if (!R.is(Number, width) || !R.is(Number, height)) {
      throw new Error('The "dummyImgSrc" helper must be passed two numeric dimensions.');
    }
  
    var result = encode(create(width, height, options.hash));
  
    return new Handlebars.SafeString(result);
  }
docs: Returns an escaped data URI for a placeholder image that can be used as the
  src attribute of an img element.
  
  @since v0.3.0
  @param {Number} width
  @param {Number} height
  @param {Object} options
  @return {String}
  @example
  <img src="{{dummyImgSrc 150 50}}">
  
  <img src="{{dummyImgSrc 150 50 text="foo"}}">
  
  <img src="{{dummyImgSrc 150 50 bg="#000"}}">
  
  <img src="{{dummyImgSrc 150 50 fg="pink"}}">