Fix ical support: updated ical object calls to match api changes in version 3.0 (see http://icalendar.readthedocs.org/en/latest/)
More robust handling of UID in tasks and projects for ical export (appending unique ids)
Reverting UUID change from commit 09e71b6339f6d44e084806ab4da6320f7e68c6c6
Remove aditional blank space
Include support for all versions of iCalendar not merely 3.0+
Include blank line as with original
Drop support for iCalendar < 3.0 and print message and quit
Merge pull request #33 from bugzy/master

Fix ical support, bump minimal version of icalendar to 3.0