correct sorting of scientific notation & number first alphanumerics; …

…fixes issue #8

naturalSort.js

@@ -5,7 +5,7 @@
 /*jshint unused:false */
 function naturalSort (a, b) {
 	"use strict";
-	var re = /(^-?[0-9]+(\.?[0-9]*)[df]?e?[0-9]?$|^0x[0-9a-f]+$|[0-9]+)/gi,
+	var re = /(^([+\-]?(?:0|[1-9]\d*)(?:\.\d*)?(?:[eE][+\-]?\d+)?)?$|^0x[0-9a-f]+$|\d+)/gi,
 		sre = /(^[ ]*|[ ]*$)/g,
 		dre = /(^([\w ]+,?[\w ]+)?[\w ]+,?[\w ]+\d+:\d+(:\d+)?[\w ]?|^\d{1,4}[\/\-]\d{1,4}[\/\-]\d{1,4}|^\w+, \w+ \d+, \d{4})/,
 		hre = /^0x[0-9a-f]+$/i,