Merge pull request #39 from clarkbw/freebusy

add the freebusy type to ical
See peterbraden#46 version to 0.3.0
Merge pull request #47 from chernjie/master

See peterbraden#46 version to 0.3.0
fix tests
bump
travis node version
no dev
Fixed #45: RRule doesn't honor start date
Merge pull request #48 from remast/master

Fixed #45: RRule doesn't honor start date