Added simple CAS test case.
Added simple CAS test case.

Change-Id: Id7aa834b2210f26cf994702aeafa1f716aa39c4c
Reviewed-on: http://review.northscale.com:8080/148
Reviewed-by: Dustin Sallings <1c08efb9b3965701be9d700d9a6f481f1ffec3ea@spy.net>
Tested-by: Dustin Sallings <1c08efb9b3965701be9d700d9a6f481f1ffec3ea@spy.net>

jimwwalker/ep-engine,daverigby/ep-engine,membase/ep-engine,zbase/ep-engine,zbase/ep-engine,couchbaselabs/ep-engine,couchbase/ep-engine,abhinavdangeti/ep-engine,owendCB/ep-engine,sriganes/ep-engine,daverigby/kv_engine,hisundar/ep-engine,teligent-ru/ep-engine,couchbase/ep-engine,zbase/ep-engine,sriganes/ep-engine,abhinavdangeti/ep-engine,abhinavdangeti/ep-engine,abhinavdangeti/ep-engine,teligent-ru/ep-engine,daverigby/kv_engine,hisundar/ep-engine,couchbaselabs/ep-engine,hisundar/ep-engine,jimwwalker/ep-engine,couchbaselabs/ep-engine,daverigby/ep-engine,daverigby/ep-engine,zbase/ep-engine,hisundar/ep-engine,daverigby/kv_engine,abhinavdangeti/ep-engine,couchbase/ep-engine,membase/ep-engine,owendCB/ep-engine,sriganes/ep-engine,teligent-ru/ep-engine,membase/ep-engine,daverigby/ep-engine,couchbase/ep-engine,jimwwalker/ep-engine,sriganes/ep-engine,teligent-ru/ep-engine,couchbaselabs/ep-engine,owendCB/ep-engine,daverigby/kv_engine,membase/ep-engine,owendCB/ep-engine,jimwwalker/ep-engine,zbase/ep-engine,couchbaselabs/ep-engine