+ add initial handling of tasks(Todos) from ics file:
  + add ics file parsing
  + add couple of Todo convenience methods: is_complete,is_overdue,fancy_due
+
- TODO:
  - add Todo tests!!!
  - Todo properties: verify correct logic/operation vs. RFC5545, particularly:
  	   duration, due, percent, completed,
  - update Event tests w.r.t. new Todo/TodoList additions
  - add more Todo.properties per RFC spec:
  - Address my design questions w/ N. Marchan:
      - ICS File Parsing Failures:
	      - Plans to fall out gracefully / send an Exception back up the stack?
		  - How to determine/display the offending Component programatically w/o
		      print statements?
		  - How do you want to handle Categories: as list or string?
  - Dump all extra/debugging comments/code