SQL & PL/SQL :: Aggregate Contiguous Range Of Days?

I intend to get for every client the start date and end of a contiguous range of days. Example for the same client have two records, in the first goes from day 1 to day 5 and the second from day 3 to day 9, i intend to get a record for this client where indicated that the start date is on day 1 and ending on Day 9.

SELECT 123 as CLI_ID, TO_DATE('20100101', 'YYYYMMDD') as DT_START, TO_DATE('20100105', 'YYYYMMDD') as DT_END FROM DUAL UNION
SELECT 123 as CLI_ID, TO_DATE('20100208', 'YYYYMMDD') as DT_START, TO_DATE('20100321', 'YYYYMMDD') as DT_END FROM DUAL UNION
SELECT 123 as CLI_ID, TO_DATE('20100219', 'YYYYMMDD') as DT_START, TO_DATE('20100228', 'YYYYMMDD') as DT_END FROM DUAL UNION
SELECT 123 as CLI_ID, TO_DATE('20100227', 'YYYYMMDD') as DT_START, TO_DATE('20100405', 'YYYYMMDD') as DT_END FROM DUAL UNION
SELECT 123 as CLI_ID, TO_DATE('20100901', 'YYYYMMDD') as DT_START, TO_DATE('20101013', 'YYYYMMDD') as DT_END FROM DUAL

Expected :

CLI_ID,DT_START,DT_END
123,01/01/2010,05/01/2010
123,08/02/2010,05/04/2010
123,01/09/2010,13/10/2010