[Merge] lp:~thomas-voss/media-hub/introduce-audio-output-observer-interface into lp:media-hub

[PS Jenkins bot]

Review: Approve continuous-integration

PASSED: Continuous integration, rev:121
http://jenkins.qa.ubuntu.com/job/media-hub-ci/269/
Executed test runs:
    SUCCESS: http://jenkins.qa.ubuntu.com/job/media-hub-vivid-amd64-ci/109
    SUCCESS: http://jenkins.qa.ubuntu.com/job/media-hub-vivid-armhf-ci/109
        deb: http://jenkins.qa.ubuntu.com/job/media-hub-vivid-armhf-ci/109/artifact/work/output/*zip*/output.zip
    SUCCESS: http://jenkins.qa.ubuntu.com/job/media-hub-vivid-i386-ci/109

Click here to trigger a rebuild:
http://s-jenkins.ubuntu-ci:8080/job/media-hub-ci/269/rebuild

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https://code.launchpad.net/~thomas-voss/media-hub/introduce-audio-output-observer-interface/+merge/242914
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