support old command(lower than 1.4.14) and timeout implemented

Nice to meet you.

I'm going to use dalli-elasticache in my production.
This is very useful for scalable. but I was face some problem. (lower than 1.4.14 is not supported.  never implement timeout, and cause long time waite.)

So. I was customize this for my production.
(support old command, and implement timeout)

please merge this if you feel good. :-)

thankyou