v1.6.0

• Implements
  func (c *Cache) LoadAndEvict(key interface{}) (interface{}, bool) and
  func (c *Cache) Pop() (key, value interface{}).
  Since the records are ordered by insertion order by default, the cache can be used as a queue.
• The background loop will no longer RLock the records.
• The background loop will only run when LFU is used or the first non-zero TTL record is stored.