#2870 - Timeago shouldn't take the user his timezone into account

When getting a 'x time ago' value we should not add the user's timezone offset.
We can rely on the browser's timezone for this information.
Merge branch 'issue-2870-timeago-timezones' of git://github.com/simong/3akai-ux into issue-2870-timeago-timezones
Made localization a parameter in parseDate