NCBC-229: Support Remove with CAS operation.

var getResult = client.ExecuteGet("key");
 var removeResult = client.ExecuteRemove("key", getResult.Cas);

NCBC-234: Fix to include CAS on return of ExecuteGetJson extension method.

NCBC-228: Fix for concurrency issues during rebalance lead to frequent PooledSocket errors.

The 1.2.2 release contains an Enyim.Caching assembly with an invalid strong name.