v4.2.0 - improved qs regex, be able to change default regex

- qs is handled a bit better now, more restrictive but better
- the constructor function accepts an `defaultRE` parameter which will be the default regular expression used if the parameter did not have one defined with it

Author: stringparser

package.json

@@ -1,7 +1,7 @@
 {
   "name": "parth",
   "main": "index.js",
-  "version": "4.1.0",
+  "version": "4.2.0",
   "engines": {
     "node": ">= 0.10.0"
   },