added toolbar to user screen #56 (#66)

* added toolbar to user screen # 56
* added filter for user role in user admin toolbar # 56
* added unit tests for queries # 56

src/AppBundle/Repository/Query/VisibilityInterface.php

@@ -21,4 +21,26 @@ interface VisibilityInterface
     const SHOW_VISIBLE = 1;
     const SHOW_HIDDEN = 0;
     const SHOW_BOTH = 2;
+
+    /**
+     * @return $this
+     */
+    public function getVisibility();
+
+    /**
+     * @param int $visibility
+     * @return $this
+     */
+    public function setVisibility($visibility);
+
+    /**
+     * @return bool
+     */
+    public function isExclusiveVisibility();
+
+    /**
+     * @param bool $exclusiveVisibility
+     * @return $this
+     */
+    public function setExclusiveVisibility($exclusiveVisibility);
 }