Add Pholio mock view basics

Summary:
Just laying more groundwork out of ready-made UI.

{F22349}

Test Plan: Looked at a mock.

Reviewers: btrahan, chad

Reviewed By: chad

CC: aran

Maniphest Tasks: T2097

Differential Revision: https://secure.phabricator.com/D3832

src/infrastructure/markup/PhabricatorMarkupEngine.php

@@ -362,7 +362,7 @@ final class PhabricatorMarkupEngine {
   /**
    * @task engine
    */
-  private static function newMarkupEngine(array $options) {
+  public static function newMarkupEngine(array $options) {
 
     $options += self::getMarkupEngineDefaultConfiguration();