[Merge] lp:~ubuntu-mate-dev/indicator-session/mate-integration into lp:indicator-session

[Martin Wimpress]

> Some small refactoring then looks good.

I've refactored have_mate_program() as per you comments. I've also add support for mate-session-save to handle the prompts for shutdown, reboot, etc.
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https://code.launchpad.net/~ubuntu-mate-dev/indicator-session/mate-integration/+merge/325600
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