Add "Africa/Tripoli" from/to "Libya Standard Time"

In Augutst 16 2013, [KB2863058](http://support.microsoft.com/kb/2863058) added a new timezone in Windows 7, then std.datetime unittest raises an error.

The timezone was released in January 2013 through [KB2794119](http://support.microsoft.com/kb/2794119).

This change will fix http://d.puremagic.com/issues/show_bug.cgi?id=10161