Change node check 2.1.6 to use operation `noteq` instead of `gt`.

Kubelet option --streaming-connection-idle-timeout expects a string
value which fails parsing to integer for greater than comparison.

The string "0" indicates no timeout and this is what we are checking
for.

Roadmap

Better config file locations for hyperkube

Support executables with multiple words (e.g. hyperkube apiserver)

Issue #25 

Update README.md

and modify text to command function to support this.

Shell builtins fail the binary command lookup test which result in a
WARN. Audit commands which include shell builtins must use the form:

   "/bin/sh -c 'sh-builtin arg'"

So they are executed properly. Additionally Go will fail to execute
commands involving shell builtins if they are not in the above format.

Use kubectl to check the kubernetes version

Create OWNERS

Issue 19, take 2

Results of manual checks are forced to WARN to inform users to check manually.

Revert "Issue 19"

Issue 19

Improve error handling.

printlnWarn: prints warning with a newline.
sprintWarn: returns an optionally contextualized warning string.