Add cloud datastore implementation.

service/datastore/finalized_query.go

Index: service/datastore/finalized_query.go
diff --git a/service/datastore/finalized_query.go b/service/datastore/finalized_query.go
index cb1b525cec4fd0e79f60efc780b51cac896f2a68..d2762881e04008c69e6b2674d3c17c45ff20d4ed 100644
--- a/service/datastore/finalized_query.go
+++ b/service/datastore/finalized_query.go
@@ -153,7 +153,7 @@ func (q *FinalizedQuery) IneqFilterProp() string {
 
 // IneqFilterLow returns the field name, operator and value for the low-side
 // inequality filter. If the returned field name is "", it means that there's
-// now lower inequality bound on this query.
+// no lower inequality bound on this query.
 //
 // If field is non-empty, op may have the values ">" or ">=".
 func (q *FinalizedQuery) IneqFilterLow() (field, op string, val Property) {
@@ -170,7 +170,7 @@ func (q *FinalizedQuery) IneqFilterLow() (field, op string, val Property) {
 
 // IneqFilterHigh returns the field name, operator and value for the high-side
 // inequality filter. If the returned field name is "", it means that there's
-// now upper inequality bound on this query.
+// no upper inequality bound on this query.
 //
 // If field is non-empty, op may have the values "<" or "<=".
 func (q *FinalizedQuery) IneqFilterHigh() (field, op string, val Property) {