[PEAK] New Trellis "time" services in peak.events.activity

[Phillip J. Eby]

FYI, I've just checked in a Trellis update that adds some new 
time-related services.  Docs are here:

http://peak.telecommunity.com/DevCenter/Trellis#managing-activities-in-clock-time

This is basically a way to let you do time-based rules without 
depending on a specific event loop implementation, as long as your 
application includes at least one rule to tie the time service to the 
application's native scheduler (e.g. wx.Timer objects or reactor.callLater).

Next up, I'll be adding objects that let you manage pseudo-processes: 
Activity objects that can be started, stopped, report an error 
result, show a completion percentage and current status, etc.

I'm not certain at this moment if all this time and activity stuff 
will remain in the Trellis package in the long term; it might get 
split into a future TrellisIO or maybe TrellisActivity package.  But 
even if I move it later, your imports (from peak.events.activity) 
should remain unchanged.