Update to Zend Stratigility 1.3

* Fix dependency version constraint. (Reverts #1066.)
* Allow exceptions to be raised when dispatching middleware.
* Fix our error handler middleware (do not implement Stratigility's
  error handler interface, catch exceptions instead).

See https://docs.zendframework.com/zend-stratigility/migration/to-v2/.

Closes #1069.

src/Http/FullStackServer.php

@@ -26,6 +26,7 @@ class FullStackServer extends AbstractServer
     protected function getMiddleware(Application $app)
     {
         $pipe = new MiddlewarePipe;
+        $pipe->raiseThrowables();
 
         $pipe->pipe(new ApiServer);
         $pipe->pipe(new AdminServer);