This commit will separate the application level logic for the 'show', 'delete',
'validate', and 'diff' commands from the Cobra logic in the cmd/ package.  The
application level logic will be placed in pkg/kubecfg/.

Improve interactive output experience by switching to a logging
library (logrus) that allows customising the output format.

This also removes the glog command line flags.  Replaced with a
simpler `--verbose`/`-v` option:
- quiet by default (warnings and errors only)
- `-v` for progress info
- `-vv` for debug

Fixes #34

Fixes #35

Rename early and often.

File format is recognised via simple file extension check.

Any "List" objects found will be expanded into their constituent
items, so single-element formats like json and jsonnet can use a
v1.List to capture multiple resource objects.

Repo was (at least initially) published under bitnami/ - make imports
consistent with that path.

Basic skeleton.  Can evaluate jsonnet and show the output as yaml or
json .. and that's about it.