Added PHP_SAPI in Php data collector

It is important to know how the php is running from cli or a web request.

src/DebugBar/DataCollector/PhpInfoCollector.php

@@ -18,7 +18,8 @@ class PhpInfoCollector extends DataCollector
     public function collect()
     {
         return array(
-            'version' => PHP_VERSION
+            'version' => PHP_VERSION,
+            'interface' => PHP_SAPI
         );
     }