testSomeStuff() doesn't work if user run the tool in non-PST timezone

[shiumachi]

Hi philz,

I failed to run the tool and got the following error:

expected: {"minDate":"2012-05-22T17:19:36.000Z","maxDate":"2012-05-22T17:29:36.000Z","logLines":[{"date":"2012-05-22T17:19:36.000Z","msg":" INFO A1234"},{"date":"2012-05-22T17:29:36.000Z","msg":" INFO A2345"}]} main.js:10
  actual: {"minDate":"2012-05-22T01:19:36.000Z","maxDate":"2012-05-22T01:29:36.000Z","logLines":[{"date":"2012-05-22T01:19:36.000Z","msg":" INFO A1234"},{"date":"2012-05-22T01:29:36.000Z","msg":" INFO A2345"}]} main.js:11
Uncaught Not equal! 

The root cause is that testSomeStuff() compares PST time with UTC time.
https://github.com/philz/logvizjs/blob/master/js/main.js#L194

I lives in JST timezone (Tokyo), so this test code always fails.