Fix broken headline in README
Merge pull request #21 from untitaker/patch-1

Fix broken headline in README
refactoring

started to get implementation details of the backend out of the user
interface, all user interfaces should solely rely on khalendar. Need some
nicer method names for khalendar though.
bugfix: model -> event everywhere

this should fix github issue #23
sample config: better defaults

this should fix github issue #24
Add icalendar as dependency