E2E tests

[lewismarshall]

We have no visibility of if and when kubectl updates can fail (#69) or if the follow functions work (manual testing required for e.g. #68).

We could add an E2E test using our testing cluster using each of the deployment types we watch. This may meen using drone instead of travis - unless there's a public k8 test option out there...

[jaykeshur]

Using minikube in travis?

[lewismarshall]

There's a couple of options documented here https://engineering.bitnami.com/articles/implementing-kubernetes-integration-tests-in-travis.html.

Probably need to decide when / if to prioritise first... maybe in prep for 1.10 release, but not just yet...