Correct typo kuberentes->kubernetes (#58)

This seems to be a common typo, possibly exacerbated by copy-paste
of comment strings. I spotted it in the README.md at first, so I fixed
that and then checked the rest of the code and fixed a few more. They
are all in comments or documentation, so there's no code issue.

FYI, there's still some in the vendor directory, but I haven't fixed
those as they'd get replaced by any new `go get` I think:

$ ack uberentes
vendor/k8s.io/apimachinery/hack/godep-deps.sh
20:# 2. godep restore based on k8s.io/kuberentes provided manifest

vendor/k8s.io/client-go/CHANGELOG.md
120:* Included bug fixes in k8s.io/kuberentes release-1.5 branch, up to

vendor/k8s.io/client-go/kubernetes/fake/register.go
64://     clientsetscheme "k8s.io/client-go/kuberentes/scheme"

vendor/k8s.io/client-go/kubernetes/scheme/register.go
64://     clientsetscheme "k8s.io/client-go/kuberentes/scheme"

Sorry, this isn't the most exciting commit in the world :-(

providers/web/broker.go

@@ -176,7 +176,7 @@ func (p *BrokerProvider) NodeConditions() []v1.NodeCondition {
 }
 
 // NodeAddresses returns a list of addresses for the node status
-// within Kuberentes.
+// within Kubernetes.
 func (p *BrokerProvider) NodeAddresses() []v1.NodeAddress {
 	var nodeAddresses []v1.NodeAddress
 	err := p.doGetRequest("/nodeAddresses", &nodeAddresses)
@@ -190,7 +190,7 @@ func (p *BrokerProvider) NodeAddresses() []v1.NodeAddress {
 }
 
 // NodeDaemonEndpoints returns NodeDaemonEndpoints for the node status
-// within Kuberentes.
+// within Kubernetes.
 func (p *BrokerProvider) NodeDaemonEndpoints() *v1.NodeDaemonEndpoints {
 	return &v1.NodeDaemonEndpoints{
 		KubeletEndpoint: v1.DaemonEndpoint{