DisableCAS support

[lovelock]

#112 #111

[tkanos]

Thanks @lovelock, It will be appreciated for McRouter with replication.

McRouter with replication gives us for gets an error :

SERVER_ERROR unexpected result mc_res_unknown (0) for get

I will use your branch waiting the merge of @bradfitz

Thanks,

[lovelock]

Thanks @lovelock, It will be appreciated for McRouter with replication.

McRouter with replication gives us for gets an error :

SERVER_ERROR unexpected result mc_res_unknown (0) for get

I will use your branch waiting the merge of @bradfitz

Thanks,

my pleasure

[eivindam]

Will this change be merged?