Make autoreload frequency configurable

[fvogl]

currently it seems to be 1s hardcoded

[simov]

I'm assuming you want it to check for updates in less than a second?

[fvogl]

@simov , actually the other way round. I would prefer an update every 5s. In any case, make it a configurable option in s or ms if you expect users to go less than 1s.