Add version stat.
Add version stat.

Change-Id: I769dfb8dfb2ffc15f20baa28655879e6a2e7f674
Reviewed-on: https://review.northscale.com:8443/1345
Reviewed-by: Sean Lynch <9c3328a4a1f4f8f5c18b2d5b9057163c49b93ff3@literati.org>
Tested-by: Sean Lynch <9c3328a4a1f4f8f5c18b2d5b9057163c49b93ff3@literati.org>

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