Bugfix for Ambiguous Local Time

[dustacio]

Nov 6, 2011 between 1-2am occurs twice and causes ambigous local time exception.

This fix applies what was suggested here:

http://groups.google.com/group/rical_gem/browse_thread/thread/dbfd63c6d671d486

[jlsync]

@dustacio thanks. using your fix now.

[rykov]

Working for me too. @rubyredrick, please merge this when you have a chance

[hez]

:+1: This is required