Add course meeting class
Add course meeting initialize and parsing methods
Move course meeting info
Add newlines at end of files
Change map to each
Store start and end time as Time objects
Add attr_readers for semester and year
Add schedule method
Add export option to courses command
Add calendar exporter class
Add client export method
Add calendar helpers class
Add calendar dtstart and dtend methods
Add calendar rrule method
Add calendar vevent method
Add calendar export functionality