[Merge] lp:~phablet-team/ubuntu-ui-toolkit/ubuntu-ui-toolkit-progressbar-label into lp:~ubuntu-sdk-team/ubuntu-ui-toolkit/staging

[Zsombor Egri]

Review: Needs Fixing

Almost forgot! Unit tests, please :)
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https://code.launchpad.net/~phablet-team/ubuntu-ui-toolkit/ubuntu-ui-toolkit-progressbar-label/+merge/223416
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