iCalendar 0.11 (2005-11-08)

• Changed component .from_string to use types_factory instead of hardcoding entries to 'inline'
• Changed UTC tzinfo to a singleton so the same one is used everywhere
• Made the parser more strict by using regular expressions for key name, param name and quoted/unquoted safe char as per the RFC
• Added some tests from the schooltool icalendar parser for better coverage
• Be more forgiving on the regex for folding lines
• Allow for multiple top-level components on .from_string
• Fix vWeekdays, wasn't accepting relative param (eg: -3SA vs -SA)
• vDDDTypes didn't accept negative period (eg: -P30M)
• 'N' is also acceptable as newline on content lines, per RFC