Switch over to k8s notification API (#202)

* Merge notification code by @aledbf and update for recent changes.
* Fix travis environment to correctly build with k8s.io and forked repositories.
* Refactored kubernetes Corefile parser
* Added lots of Corefile parsing tests

middleware/kubernetes/util/util.go

@@ -3,6 +3,9 @@ package util
 
 import (
 	"strings"
+
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/client/cache"
 )
 
 // StringInSlice check whether string a is a member of slice.
@@ -24,3 +27,16 @@ const (
 	WildcardStar = "*"
 	WildcardAny  = "any"
 )
+
+// StoreToNamespaceLister makes a Store that lists Namespaces.
+type StoreToNamespaceLister struct {
+	cache.Store
+}
+
+// List lists all Namespaces in the store.
+func (s *StoreToNamespaceLister) List() (ns api.NamespaceList, err error) {
+	for _, m := range s.Store.List() {
+		ns.Items = append(ns.Items, *(m.(*api.Namespace)))
+	}
+	return ns, nil
+}