Extend multi get filler allowed types (QuangTung97#10)

Reduce Heap Allocations (QuangTung97#8)

* Reduce Memory Allocation for Item Get

* Reduce Allocs for Proxy

Add Example for Single Memcached Server (QuangTung97#7)

* Add Example for Single Memcached Server

Fix Race Condition

Update go memcache

Upgrade memcache client

Upgrade memcache client

Upgrade memcache fix size zero

Upgrade memcache

Upgrade go memcache