Error when multiple files listed in `KUBECONFIG` env-variable

[mortenlj]

The KUBECONFIG env-variable supports multiple files (separated by :). The kubernetes library supports this, but powerline-kubernetes does it's own thing when loading the context, and doesn't handle multiple files.

[wwmoraes]

I have a working patch on my fork, MR #22

to start using it right away while the MR is not merged:

pip uninstall powerline-kubernetes
pip install https://github.com/wwmoraes/powerline-kubernetes/tarball/master#egg=powerline-kubernetes