Merge pull request #75 from grknight/1.8/develop

Add Smarty plugins based on Twig Extensions
Added support for the Lex parser
Update lex.php

Just needed the forward slash to find lex - otherwise it works perfect.
Merge pull request #76 from codeChap/patch-1

Update lex.php
Removed Markdown; switched to the composer package installed by the core
updated the README
removed SimpleTags from the bootstrap
added Lex packagist URL
Fix one parameter on html_anchor Smarty extension which will throw a notice on use