Add autoload; increasing min php version; change array to short syntax

ext_emconf.php

-<?php
-
-$EM_CONF[$_EXTKEY] = array (
+$EM_CONF[$_EXTKEY] = [
 	'title' => 'tinyMCE',
 	'description' => 'TinyMCE sources including a small PHP API',
 	'category' => 'misc',
@@ -12,19 +10,18 @@ $EM_CONF[$_EXTKEY] = array (
 	'author' => 'Stefan Galinski',
 	'author_email' => 'stefan@sgalinski.de',
 	'author_company' => 'sgalinski Internet Services',
+	'autoload' => 
+        [
+            'psr-4' => ['SGalinski\\Tinymce\\' => 'Classes']
+        ],
 	'constraints' => 
-	array (
-		'depends' => 
-		array (
-			'php' => '5.3.0-5.6.99',
-			'typo3' => '6.2.0-7.6.99',
-		),
-		'conflicts' => 
-		array (
-		),
-		'suggests' => 
-		array (
-		),
-	),
-);
-
+	    [
+		    'depends' => 
+    		    [
+	    		    'php' => '5.5.0-0.0.0',
+		    	    'typo3' => '6.2.0-7.6.99',
+		        ],
+		    'conflicts' => [],
+		    'suggests' => [],
+	    ],
+];