Adds one entry point for both JSON and MP APIs

Removes endpoints folder and moves versions to the root
JSON API folder

tests/unit/API/JSON/v1/SetupTest.php

@@ -0,0 +1,30 @@
+<?php
+use Helper\WordPressHooks as WPHooksHelper;
+use MailPoet\API\JSON\Response as APIResponse;
+use MailPoet\API\JSON\v1\Setup;
+use MailPoet\Models\Setting;
+
+class SetupTest extends MailPoetTest {
+  function _before() {
+    Setting::setValue('signup_confirmation.enabled', false);
+  }
+
+  function testItCanReinstall() {
+    WPHooksHelper::interceptDoAction();
+
+    $router = new Setup();
+    $response = $router->reset();
+    expect($response->status)->equals(APIResponse::STATUS_OK);
+
+    $signup_confirmation = Setting::getValue('signup_confirmation.enabled');
+    expect($signup_confirmation)->true();
+
+    $hook_name = 'mailpoet_setup_reset';
+    expect(WPHooksHelper::isActionDone($hook_name))->true();
+  }
+
+  function _after() {
+    WPHooksHelper::releaseAllHooks();
+    Setting::deleteMany();
+  }
+}