Better caldav support (#73)

vendor/github.com/samedi/caldav-go/lib/strbuff.go

@@ -0,0 +1,18 @@
+package lib
+
+import (
+	"bytes"
+	"fmt"
+)
+
+type StringBuffer struct {
+	buffer bytes.Buffer
+}
+
+func (b *StringBuffer) Write(format string, elem ...interface{}) {
+	b.buffer.WriteString(fmt.Sprintf(format, elem...))
+}
+
+func (b *StringBuffer) String() string {
+	return b.buffer.String()
+}