icalendar/icalendar — pull request #43 by zerobearing2 (2013-11-03 15:19:25+00:00)
Title: FIXED: throws TZInfo::AmbiguousTime during day-light-savings transition

Allow the use of ```dst``` boolean to be used for ```TZInfo::Timezone#ical_timezone```, otherwise it will throw TZInfo::AmbiguousTime during a day-light-savings transition.

Reference: http://rubydoc.info/gems/tzinfo/TZInfo/Timezone:period_for_local