[Merge] lp:~tiagosh/telephony-service/wakeup-mms into lp:telephony-service

[Bill Filler]

Review: Needs Fixing

We shouldn't turn on the screen if we are on an active call and the proximity sensor is on (phone up to ear). Maybe this should be calling a method on powerd rather than on Unity?
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https://code.launchpad.net/~tiagosh/telephony-service/wakeup-mms/+merge/238611
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