The DateUtils.stringify test failed in UTC+08:00

When the time zone is ahead of UTC/GMT the returned value for
Date.getTimezoneOffset will be negative. The previous test turned that around.

https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Date/getTimezoneOffset
Merge branch 'master' of https://github.com/gaqzi/lavaca into 1.0.6
closes #55