Add Support for externalIPs #52
Description
https://kubernetes.io/docs/api-reference/v1.5/#servicespec-v1-core
externalIPs is a list of IP addresses for which nodes in the cluster will also accept traffic for this service. These IPs are not managed by Kubernetes. The user is responsible for ensuring that traffic arrives at a node with this IP. A common example is external load-balancers that are not part of the Kubernetes system. A previous form of this functionality exists as the deprecatedPublicIPs field. When using this field, callers should also clear the deprecatedPublicIPs field.