Schedule timezone config, API tweak, add tests for schedule

[peterkos]

There should be a config option for setting the timezone that the entire HM interface is referenced from.

Additionally, the API should return something like the following (pseudocode because JSON lol):

// GET /schedule
"schedule": {
    "event1": {
        "name": "asdf",
        "time": "12831739", // whatever unix
        "timeZone": "GMT",
        // ...
    }
}

Key elements:

• time in GMT
• timeZone from the config file

[JeremyRudman]

#226 merged in

[JeremyRudman]

blocked by #480

[JeremyRudman]

semi implemented #551