This release fixes a number of issues around the storage of the false value in a MemcachedCache.

Total issues resolved: 4

• 159: The CacheProvider::fetchMultiple method throw a warning level error thanks to @thenbsp
• 161: Memcached: doContains return true pretty much everytime if the stored value is false thanks to @riquito
• 181: Memcached: fix doContains return true even if status code is an error thanks to @omouren
• 199: Memcached: fix doContains return true even if status code is an error (related to #181) thanks to @JonasHaouzi