Show date and time on Schedules and Details in UTC (TNL-85).

Make the dates/times on the Schedules and Details page reflect UTC, not the local time. 

Issue: https://openedx.atlassian.net/browse/TNL-85

Sandbox: http://studio.olmar.m.sandbox.edx.org/
Reviewers: @polesye @cahrens 
This way of adding am and pm (and why are they lower case?) will be problematic for translation. I would doing an if/else so the text can be properly translated. For example,

if (hours < 12) {
    currentTimeText = gettext('%(hours)s:%(minutes)s AM (current UTC time)');
}
else {
    currentTimeText = gettext('%(hours)s:%(minutes)s PM (current UTC time)');
}

Or just go to using 24-hour day instead of AM/PM.