docs update for 1.5

[waynew]

trafficstars

There's probably a lot of docs that we need to update for 1.5 - if anyone can go through and audit the docs for stuff like, old Python versions, etc. and add those here that would be awesome!

[waynew]

(also it'd be worth noting in the documentation that this will be the officially recommended replacement for the smtpd module)