code: function maybe (options) {
    if (Math.round(Math.random())) {
      return options.fn(this);
    } else {
      return options.inverse(this);
    }
  }
docs: Output a block randomly (50% chance of being output). Useful for prototyping
  multiple content scenarios, outputting one or two "dummy" blocks of markup.
  
  @since v0.0.1
  @example
  {{#maybe}}
  Heads!
  {{else}}
  Tails!
  {{/maybe}}