[lipstick] Allow immediate locking via LipstickSettings API.
Merge pull request #118 from martinjones/master

[lipstick] Allow immediate locking via LipstickSettings API.
[lipstick] Add a signal for when the display is about to be turned on
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[lipstick] Possibility to remove a single notification from the UI side
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[lipstick] Fix for removing a single notification from the UI side
[lipstick] Use queued connections for notification actions and removals
[lipstick] Fix unit tests
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[lipstick] Fix devicelock to use QSettings and not GConf