Controller view vars. Refs #2970.

Rewrite of the way Controller passes View vars to view on  construction. Refs #2970.

Controller used to store a bunch of variables that were only used by the view. This has been deprecated. Instead Controller::setViewOption(<opt>,<val>) is used. Controller will pass these variables over to View on construction. The method Controller::getViewObject() is the factory method that creates the view passing in these stashed variables. If you want to the stashed variables passed over you have to use this factory method - which is now public. Controller does not provide defaults for variables that clearly are nothing to do with the Controller. However, there are still a few view options that Controller does set, when creating a View. These are currently name, plugin, passedArgs, helpers. In review, the following lists the variables that used to be passed from controller to view and how the passing has changed: 

 * viewVars        not passed, now a formal param to View::__contruct()
 * autoLayout     not passed at all anymore
 * ext                  not passed at all anymore
 * helpers           controller and view
 * view                view only - set via setViewOption()
 * layout             view only - set via setViewOption()
 * name              controller and view
 * theme             view only - set via setViewOption()
 * layoutPath      view only - set via setViewOption()
 * viewPath         view only - set via setViewOption()
 * request           not passed, now a formal param to View::__contruct()
 * plugin             controller and view
 * passedArgs    controller and view
 * cacheAction    view only - set via setViewOption()

Might be helpful to note; The old View constructor: 

	public function __construct(Controller $controller = null) {

The new View constructor:

	public function __construct(Array $viewOptions, Array $viewVars, EventManager $eventManager = null, Request $request = null, Response $response = null) {

There are still failing tests so I dot expect this PR to be accepted as is. Hope that is OK?