Added the option to enforce the encoding

Author: paquettg

src/PHPHtmlParser/Dom.php

@@ -594,6 +594,14 @@ protected function detectCharset()
 		$encode->from($this->defaultCharset);
 		$encode->to($this->defaultCharset);
 
+		if ( ! is_null($this->options->enforceEncoding))
+		{
+			//  they want to enforce the given encoding
+			$encode->from($this->options->enforceEncoding);
+			$encode->to($this->options->enforceEncoding);
+			return false;
+		}
+
 		$meta = $this->root->find('meta[http-equiv=Content-Type]', 0);
 		if (is_null($meta))
 		{

src/PHPHtmlParser/Options.php

@@ -11,6 +11,7 @@ class Options {
 	protected $defaults = [
 		'whitespaceTextNode' => true,
 		'strict'             => false,
+		'enforceEncoding'    => null,
 	];
 
 	/**