Merge pull request #211 from andrewstuart/variadic-register

Add *RegisterAll functions with variadic args

prometheus/registry.go

@@ -115,13 +115,15 @@ func Register(m Collector) error {
 }
 
 // MustRegister works like Register but panics where Register would have
-// returned an error.
-func MustRegister(m Collector) {
-	err := Register(m)
-	if err != nil {
+// returned an error. MustRegister is also Variadic, where Register only
+// accepts a single Collector to register.
+func MustRegister(m ...Collector) {
+	for i := range m {
+		if err := Register(m[i]); err != nil {
 			panic(err)
 		}
 	}
+}
 
 // RegisterOrGet works like Register but does not return an error if a Collector
 // is registered that equals a previously registered Collector. (Two Collectors