DOMDocument::saveHTML() with $node parameter on php < 5.3.6

[Lomanic]

As discussed here, Parsedown-extra now uses uses DOMDocument::savehtml() with the $node parameter, and so we need PHP 5.3.6 (see savehtml()'s Changelog), testing with php 5.3.3 gives the following errors:

Warning: DOMDocument::saveHTML() expects exactly 0 parameters, 1 given in /var/home/XXX/www/picocms4/vendor/erusev/parsedown-extra/ParsedownExtra.php on line 492
Warning: DOMDocument::loadHTML(): Empty string supplied as input in /var/home/XXX/www/picocms4/vendor/erusev/parsedown-extra/ParsedownExtra.php on line 471
Catchable fatal error: Argument 1 passed to DOMNode::removeChild() must be an instance of DOMNode, null given, called in /var/home/XXX/www/picocms4/vendor/erusev/parsedown-extra/ParsedownExtra.php on line 496 and defined in /var/home/XXX/www/picocms4/vendor/erusev/parsedown-extra/ParsedownExtra.php on line 472

You should at least add this requirement in your composer.json as below

{
    "name": "erusev/parsedown-extra",
    "description": "An extension of Parsedown that adds support for Markdown Extra.",
    "keywords": ["markdown", "markdown extra", "parser", "parsedown"],
    "homepage": "https://github.com/erusev/parsedown-extra",
    "type": "library",
    "license": "MIT",
    "authors": [
        {
            "name": "Emanuil Rusev",
            "email": "[email protected]",
            "homepage": "http://erusev.com"
        }
    ],
    "require": {
        "php": ">=5.3.6",
        "erusev/parsedown": "~1.4"
    },
    "autoload": {
        "psr-0": {"ParsedownExtra": ""}
    }
}

Issue related to #44, #57 and #58