Better caldav support (#73)

vendor/github.com/samedi/caldav-go/data/user.go

@@ -0,0 +1,8 @@
+package data
+
+// CalUser represents the calendar user. It is used, for example, to
+// keep track globally what is the current user interacting with the calendar.
+// This user data can be used in various places, including in some of the CALDAV responses.
+type CalUser struct {
+	Name string
+}