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

[Andrew Hayzen]

Review: Approve

LGTM, fixes the issues I was having. As discussed we may split up the PrinterBackend later, but it is fine for now.
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https://code.launchpad.net/~jonas-drange/ubuntu-settings-components/printerbackend/+merge/315317
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