Add priority to collaborator

Author: IvanChepurnyi

spec/Runner/CollaboratorMaintainerSpec.php

@@ -19,5 +19,8 @@ function it_should_support_any_example_node(ExampleNode $example)
         $this->supports($example)->shouldReturn(true);
     }
 
-    
+    function it_has_higher_priority_than_current_collaborator_maintainer()
+    {
+        $this->getPriority()->shouldReturn(49);
+    }
 }

src/Runner/CollaboratorMaintainer.php

@@ -37,6 +37,6 @@ public function teardown(
 
     public function getPriority()
     {
-        // TODO: Implement getPriority() method.
+        return 49;
     }
 }