Work on following relations api and small docs

server/apiLinstromTypes.go

@@ -96,6 +96,7 @@ type linstromRelation struct {
 	UpdatedAt time.Time `jsonapi:"attr,updated-at"`
 	FromId    string    `jsonapi:"attr,from-id"`
 	ToId      string    `jsonapi:"attr,to-id"`
+	Requested bool      `jsonapi:"attr,requested"`
 	Accepted  bool      `jsonapi:"attr,accepted"`
 }