[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
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https://code.launchpad.net/~ken-vandine/content-hub/pasteboard/+merge/296352
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