Merge branch 'php-minversion-detec' into 'nightly'

installer::checkPrereqs bump PHP version to 5.5.0

Related to #102 

See merge request !63

lib/installer.php

@@ -96,8 +96,8 @@ abstract class Installer
             }
         }
 
-        if (version_compare(PHP_VERSION, '5.3.2', '<')) {
-            $this->warning('Require PHP version 5.3.2 or greater.');
+        if (version_compare(PHP_VERSION, '5.5.0', '<')) {
+            $this->warning('Require PHP version 5.5.0 or greater.');
             $pass = false;
         }