def banner(options = {}, &_block)
      options = {
        comment: :js
      }.update(options)

      if block_given?
        @_banner = yield.to_s
      elsif !@_banner
        @_banner = default_banner.join("\n")
      end

      if options[:comment]
        comment(@_banner, style: options[:comment])
      else
        @_banner
      end
    end
def banner(options = {}, &_block)
      options = {
        comment: :js
      }.update(options)

      if block_given?
        @_banner = yield.to_s
      elsif !@_banner
        @_banner = default_banner.join("\n")
      end

      if options[:comment]
        comment(@_banner, style: options[:comment])
      else
        @_banner
      end
    end
Generates a banner if a block is given, or returns the currently set banner.
 It automatically takes care of adding comment marks around the banner.

 The default banner looks like this:

 =======================
 = Version : v1.0.0    =
 = Date : 2012-06-20   =
 =======================


 @option options [:css,:js,:html,false] :comment Wether or not to comment the output and in
   what style. (default=js)