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

[PS Jenkins bot]

Review: Approve continuous-integration

PASSED: Continuous integration, rev:128
http://jenkins.qa.ubuntu.com/job/media-hub-ci/285/
Executed test runs:
    SUCCESS: http://jenkins.qa.ubuntu.com/job/media-hub-vivid-amd64-ci/125
    SUCCESS: http://jenkins.qa.ubuntu.com/job/media-hub-vivid-armhf-ci/125
        deb: http://jenkins.qa.ubuntu.com/job/media-hub-vivid-armhf-ci/125/artifact/work/output/*zip*/output.zip
    SUCCESS: http://jenkins.qa.ubuntu.com/job/media-hub-vivid-i386-ci/125

Click here to trigger a rebuild:
http://s-jenkins.ubuntu-ci:8080/job/media-hub-ci/285/rebuild

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