event.html: Make tables myEventTable and myReponseTable as ring buffer

This will prevent them to growth indefinitely, especially in case you
have a lot of events comming from nodes.

Signed-off-by: Kiril Petrov <vscp@geomi.org>
Merge pull request #26 from retfie/master_retfie

event.html: Make tables myEventTable and myReponseTable as ring buffer