Added basic support for Markdown-extra format.

handlers/md/Readme.md

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+# WikkaWiki Markdown Handler plugin
+[![Markdown](images/Markdown.png)](http://markdown.cebe.cc)
+[![WikkaWiki](images/wikka_logo.jpg)](http://wikkawiki.org/HomePage)
+[![Prism](images/prism-syntaxhighlighter.png)](http://prismjs.com/)
+
+## What is this?
+Yes, this is a markdown parser for [WikkaWiki](http://wikkawiki.org/HomePage) for Markdown, the magic is from the [Cebe Markdown parser](http://markdown.cebe.cc/).
+
+![Edit Markdown](images/mmymdoc_edit.png)
+> Note that the current Geshi buttons are for the Wikka format, Im am working on use the [yii2-markdown](https://github.com/kartik-v/yii2-markdown), for the edit controls. But Markdown is not a dificult Format to learn.
+
+Easy steeps:
+
+1. Put this repo on "/plugins/handlers/md" directory.
+
+2. Copy the prisma css and js to your theme.
+
+3. Add the ".md" support to your Wakka.class.php file, this like on the example located on this repo "examples/Wakka.class.php.example".
+
+The detalled installed is explain on the next points:
+(Sorry for my English Im gonna to fix this at some time.)
+
+![Parse Markdown](images/mmymdoc_parse.png)
+
+## Why?
+By defect WikkaWiki has their own formatting rules (these rules work like a charm), but on this days is very common to write all kain of documentation on Markdown, Markdown is the prefered formatting code for all kain of projects. I dont have a problem to know both ways of formatting, but is a lot of work traduce from one to the other, this plugin works on this point.
+
+## How?
+This plugin works in two ways (both if you wish), supose that mydoc and mydoc.md contains a document on Markdown format:
+
+1. With a Handler md.
+For example:
+```
+ wikka.php?wakka=mmymdoc/md
+```
+
+2. With a document that finish on ".md".
+For example:
+```
+ wikka.php?wakka=mmymdoc.md
+```
+
+### How install it?
+This plugins has two behaviors:
+
+#### Install the handler:
+The first is like a simple Handler, this meaning that you have to add "/md" to the end of the url. In any case you have to install the handler for both opions:
+
+1. Drop this repo on your "/plugins/handlers/md" directory.
+Directory Estructure:
+![Directory estructure](images/md_handler.png)
+
+2. Copy the prism.js and prims.css to your "templates" directory (look into your configuration file your theme classic/kubric/light and copy on your respective css/js directorys).
+
+```php
+....
+'theme' => 'classic'
+....
+
+```
+
+Now, If you completed this, create a new document like this:
+
+~~~~
+wikka.php?wakka=mmymdoc
+~~~~
+
+~~~~
+# Cacti docker container
+
+First Header  | Second Header
+------------- | -------------
+Content Cell  | Content Cell
+Content Cell  | Content Cell
+
+```language-css
+.example {
+		font-size: 2em;
+	}
+```
+~~~~
+
+And try to acces with:
+~~~~
+wikka.php?wakka=mmymdoc/md
+~~~~
+
+#### Configure for automatic access:
+If you are like me, you want to access to the document direct without adding "/md", then you have to add the support for the ".md" extencion on your wikis documents.
+
+Edit the follow code near to the end of "libs/Wakka.class.php", backup your original file and the new must be like:
+
+```php
+elseif( $this->GetHandler() == 'show' && pathinfo($this->GetPageTag(), PATHINFO_EXTENSION) == 'md' && $this->page['body'] != '' )
+{
+  // Hugly handler but util.
+  $this->Handler($this->handler = 'md');
+  echo $this->Header();
+  echo $this->Handler($this->GetHandler());
+  echo $this->Footer();
+}
+```
+On any case I leave a copy of my Wakka.class.php on the project directory.
+
+From now you can create mmymdoc.md and the system gonna to use the Markdown parser automaticly. (you can access to the edit page with dobleclik like the normal way.)
+
+```
+ wikka.php?wakka=mmymdoc.md
+```
+
+![Edit Markdown](images/mmymdoc_edit.png)
+If you dont have highliht review the css and js prism path:
+![Parse Markdown](images/mmymdoc_parse.png)
+
+> Note that the current Geshi buttons are for the Wikka format, Im am working on use the [yii2-markdown](https://github.com/kartik-v/yii2-markdown), for the edit controls. But Markdown is not a dificult Format to learn.
+
+[WikkaWiki](http://wikkawiki.org/HomePage) is a flexible, standards-compliant and lightweight wiki engine written in PHP, which uses MySQL to store pages.
+[Cebe Markdown parser](http://markdown.cebe.cc/) A super fast, highly extensible markdown parser for PHP.

handlers/md/composer.json

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+{
+    "require": {
+        "cebe/markdown": "^1.1"
+    }
+}