removing exposure of patternExtension

Author: dmolsen

src/PatternLab/Config.php

@@ -240,7 +240,6 @@ public static function init($baseDir = "", $verbose = true) {
 		self::setExposedOption("ishFontSize");
 		self::setExposedOption("ishMaximum");
 		self::setExposedOption("ishMinimum");
-		self::setExposedOption("patternExtension");
 		self::setExposedOption("outputFileSuffixes");
 		self::setExposedOption("plugins");