[Merge] lp:~tiagosh/history-service/cached-conversations into lp:history-service

[Tiago Salem Herrmann]

> I have added some comments in the diff itself, but the idea is good.
> 
> I just haven't seen any code (maybe I missed it) to add new threads to the
> cache (when a new thread is created), is that something we want to handle in
> the cache system?

all comments addressed.

-- 
https://code.launchpad.net/~tiagosh/history-service/cached-conversations/+merge/271536
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