API Refactor for removal of CMSForm class

.travis.yml

@@ -28,7 +28,7 @@ before_script:
   - composer self-update || true
   - git clone git://github.com/silverstripe-labs/silverstripe-travis-support.git ~/travis-support
   - "if [ \"$BEHAT_TEST\" = \"\" ]; then php ~/travis-support/travis_setup.php --source `pwd` --target ~/builds/ss; fi"
-  - "if [ \"$BEHAT_TEST\" = \"1\" ]; then php ~/travis-support/travis_setup.php --source `pwd` --target ~/builds/ss --require silverstripe/behat-extension,silverstripe/cms; fi"
+  - "if [ \"$BEHAT_TEST\" = \"1\" ]; then php ~/travis-support/travis_setup.php --source `pwd` --target ~/builds/ss --require silverstripe/behat-extension:~2,silverstripe/cms; fi"
   - cd ~/builds/ss
   - php ~/travis-support/travis_setup_selenium.php --if-env BEHAT_TEST
   - php ~/travis-support/travis_setup_php54_webserver.php --if-env BEHAT_TEST

code/controller/SiteConfigLeftAndMain.php

@@ -63,10 +63,24 @@ public function getEditForm($id = null, $fields = null)
 		}
 
 		$actions = $siteConfig->getCMSActions();
-		$form = CMSForm::create( 
+		$negotiator = $this->getResponseNegotiator();
+		/** @var Form $form */
+		$form = Form::create(
 			$this, 'EditForm', $fields, $actions, $validator
 		)->setHTMLID('Form_EditForm');
-		$form->setResponseNegotiator($this->getResponseNegotiator());
+		$form->setValidationResponseCallback(function() use ($negotiator, $form) {
+			$request = $this->getRequest();
+			if($request->isAjax() && $negotiator) {
+				$form->setupFormErrors();
+				$result = $form->forTemplate();
+
+				return $negotiator->respond($request, array(
+					'CurrentForm' => function() use($result) {
+						return $result;
+					}
+				));
+			}
+		});
 		$form->addExtraClass('cms-content center cms-edit-form');
 		$form->setAttribute('data-pjax-fragment', 'CurrentForm');