Modifications to slm

p.render = function(src, model, options, vm) {
  vm = vm || new this.VM();

  var js_beautify = require('js-beautify');
  if (undefined !== js_beautify) {
    var html_beautify = require('js-beautify').html;
  }

  var compiled = this.compile(src, options, vm)(model, vm);

  if (html_beautify !== undefined) {
    compiled = html_beautify(compiled, {
      "indent_size": 2,
      "space_after_anon_function": true,
      "end_with_newline": true
    });
  }

  return compiled;
};