Add inwardHtml/outwardHtml functions to Config object

[ray]

I suppose there will be a lot of people to find this useful.

Example usage: You want your HTML to use b and i instead of strong and em

xinha_config.outwardHtml = function(html) { 
  html = html.replace(/<(\/?)strong(\s|>|\/)/ig, "<$1b$2");
  html = html.replace(/<(\/?)em(\s|>|\/)/ig, "<$1i$2");
	return html;
}

[ray]

added rev [998]