Add: DBService.js for client

src/web/php/db/db_method_container.php

@@ -1,5 +1,5 @@
 <?php
-class DBMethodCollection
+class DBMethodContainer
 {
 	protected $mysqli;
 

src/web/php/db/writing_collection.php

@@ -1,5 +1,5 @@
 <?php
-class WritingCollection extends DBMethodCollection
+class WritingCollection extends DBMethodContainer
 {
 
 	public function getSystemWritingList()