Update CONTRIBUTORS.txt
Merge pull request #35 from tschager/patch-1

Update CONTRIBUTORS.txt
quick event adding: bugfix
test for extended event addition
nicer error message if resource is not CalDAV

"backport" from vdirsyncer
release v0.1.0
Merge branch 'master' of github.com:geier/khal
bugfix ikhal: new events where had false accounts

This should fix github issue #36.
Thanks to jasonwryan for reporting it.
merge