functions branch and region support (#330)

* branch and region support

* .

* .

* .

* .

* fix functions

* .

* break loop

* update example

* update examples

function/handler/function.go

@@ -0,0 +1,16 @@
+package handler
+
+import (
+	"regexp"
+)
+
+var (
+	IDFormat   = regexp.MustCompilePOSIX("[a-z0-9-]+")
+	NameFormat = regexp.MustCompilePOSIX("[a-z0-9]+")
+
+	FunctionKey    = "function/func/"
+	OwnerKey       = "function/owner/"
+	ReservationKey = "function/reservation/"
+)
+
+type Function struct{}