Bug 21662: (QA follow-up) Use commitdates over RM dates

Bug 21662: (QA follow-up) Use commitdates over RM dates

The manual maintanence of the history.txt file lead to some
discrepancies in first commit dates for many contributors. After a
discussion regarding the automation proccess (and with some of the
contributors who would be most heavily affected) we decided to update
the history file on mass to match the commite dates found in the
repository.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>