Refactoring

* Refactors clearOneObjectFromCache to be more clear.
  Will always have to return true for lacking ability
  to check for missing cache key.
* Better default flag for set method.

Author: nicholasruunu

src/MemcacheCachePool.php

@@ -39,14 +39,13 @@ protected function clearAllObjectsFromCache()
 
     protected function clearOneObjectFromCache($key)
     {
-        $flags = false;
-        $this->cache->delete($key, $flags);
+        $this->cache->delete($key);
 
-        return $flags === false;
+        return true;
     }
 
     protected function storeItemInCache($key, CacheItemInterface $item, $ttl)
     {
-        return $this->cache->set($key, $item, false, $ttl ?: 0);
+        return $this->cache->set($key, $item, 0, $ttl ?: 0);
     }
 }