Update validation rules documentation (#144)

* Update rules.md

* Fix broken links by lowercasing the hashtags

* Alnum code example

* Add alpha code example

* Fix alpha example

* Add between code example

* Fix spelling error, "i" has been bought.

* Add bool, creditCard, and datetime examples

* Add digits, float, int, each, and email examples

* Add equals example

* Add link to the default validation rules in the readme

* Add greaterThan, and hash examples

* Add inArray examples

* Add isArray, json, length, lengthbetween, and lessThan examples

* Add numeric examples and a back to top link

* Add phone, regex, string, and url examples

* Add uuid to the docs, and fix the alphabetical order

* Add required and optional rules to the documentation

* Fix alphabetical order in the Chain

* Fix copy paste fail, don't tell anyone

* Add missing self constant reference on the Hash rule

README.md

@@ -44,7 +44,7 @@ $result->getMessages();
 * Overwrite the default error messages on rules, or error messages on specific values
 * Get the validated values of an array
 * Validate different contexts (insert, update, ect) inheriting validations of the default context
-* A large set of default validation rules
+* [A large set of default validation rules](http://validator.particle-php.com/en/latest/rules/)
 * Ability to extend the validator to add your own custom rules
 
 ## Non functional features