4 parameters, "timestamp", "minTimestamp", "maxiTimestamp" and "maxVersions" are added to HBaseSparkConf. Users can select a timestamp, they can also select a time range with minimum timestamp and maximum timestamp. Signed-off-by: Sean Busbey <busbey@apache.org> Signed-off-by: Ted Yu <tedyu@apache.org> Signed-off-by: Jerry He <jerryjch@apache.org>