Fist step to #4

src/ORM/Connections.php

@@ -25,11 +25,11 @@ class Connections {
         return self::$_connections;
     }
 
-    public static function add_connection($pdo, $name = 'default') {
+    public static function addConnection($pdo, $name = 'default') {
         self::getInstance()->connections[$name] = $pdo;
     }
 
-    public static function get_connection($name = 'default') {
+    public static function getConnection($name = 'default') {
         return self::getInstance()->connections[$name];
     }