[Merge] lp:~smd-seandavis/ubuntu/trusty/xfce4-power-manager/sync_lock_xfpm_session into lp:ubuntu/xfce4-power-manager

[Chris J Arges]

Review: Needs Fixing

So this merge had some extra files added in .pc. I fixed this and sponsored it with just the additional patch in debian/patches, the updated series file and the updated changelog.
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https://code.launchpad.net/~smd-seandavis/ubuntu/trusty/xfce4-power-manager/sync_lock_xfpm_session/+merge/214392
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