Implement view factory method in Piwik_View.
Direct instantiation: (plugins/CoreUpdater/Controller.php)
$view = new Piwik_View('CoreUpdater/templates/update_welcome.tpl');
Factory method: (uses caller context to determine path)
$view = Piwik_View::factory('update_welcome');
In [1387], fixes #921 - add factory method to Piwik_View; tested with CoreUpdater (browser and command line)