Allow only one anniversary to comply with VCard 4 (fixes #277)
Don't crash when Calendar Provider is not available at account creation
(fixes #276)
Handle HTTP redirections (fixes #83)
Add support for well-known URIs (RFC 5785) - closes #148
Version bump to 0.6 (drop -alpha suffix)
Handle redirections to relative URLs correctly (see #282) + tests; minor GUI change
Merged with upstream changes