[Merge] lp:~jonas-drange/ubuntu-settings-components/buffer-printer-state-events into lp:~phablet-team/ubuntu-settings-components/printer-components

[Jonas G. Drange]

Jonas G. Drange has proposed merging lp:~jonas-drange/ubuntu-settings-components/buffer-printer-state-events into lp:~phablet-team/ubuntu-settings-components/printer-components with lp:~jonas-drange/ubuntu-settings-components/asyncness as a prerequisite.

Commit message:
* adds PrinterSignalHandler that is responsible for handling (some) printer signals.
* uses PrinterSignalHandler in PrinterModel so that i only will update printers a minimum number of times

Requested reviews:
  Unity Team (unity-team)

For more details, see:
https://code.launchpad.net/~jonas-drange/ubuntu-settings-components/buffer-printer-state-events/+merge/317485
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