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

[PS Jenkins bot]

Review: Needs Fixing continuous-integration

FAILED: Continuous integration, rev:131
http://jenkins.qa.ubuntu.com/job/media-hub-ci/298/
Executed test runs:
    FAILURE: http://jenkins.qa.ubuntu.com/job/media-hub-vivid-amd64-ci/138/console
    SUCCESS: http://jenkins.qa.ubuntu.com/job/media-hub-vivid-armhf-ci/138
        deb: http://jenkins.qa.ubuntu.com/job/media-hub-vivid-armhf-ci/138/artifact/work/output/*zip*/output.zip
    SUCCESS: http://jenkins.qa.ubuntu.com/job/media-hub-vivid-i386-ci/138

Click here to trigger a rebuild:
http://s-jenkins.ubuntu-ci:8080/job/media-hub-ci/298/rebuild

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