[Merge] lp:~ken-vandine/content-hub/pasteboard into lp:content-hub

[Daniel d'Andrada]

> Made some modifications here:
> http://bazaar.launchpad.net/~dandrader/content-hub/pasteboard/revision/285
> 
> - Fix unnecessary round trip and memory leak when fetching a Paste from the
> service
> - Simplify D-Bus interface and traffic using ay instead of av
> - Create separate sync and async versions of createPaste

Oh, and added async versions for latestPaste() and pasteById() as well.
-- 
https://code.launchpad.net/~ken-vandine/content-hub/pasteboard/+merge/296352
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