code: function(handlebars, directory, filepath, opts, done) {
  		var regex = (typeof opts.match === 'string') ? new RegExp(opts.match) : opts.match || /\.(html|hbs)$/,
  			isValidTemplate = regex.test(filepath);
  
  		if (!isValidTemplate) {
  			return done(null);
  		}
  
  		fs.readFile(filepath, 'utf8', function(err, data) {
  			if (!err) {
  				var ext = path.extname(filepath);
  				var templateName = path.relative(directory, filepath)
  				.slice(0, -(ext.length)).replace(/[ -]/g, '_').replace(/\\/g, '/');
  				if (typeof opts.name === 'function') templateName = opts.name(templateName);
  				handlebars.registerPartial(templateName, data);
  				return done(undefined, templateName);
  			}
  
  			done(err);
  		});
  	}
docs: Precompile a partial