Restructure modules to have a top level kubernetes module

[mbohlool]

Update project information for getting it ready to release 0.1.0 in pypi.

package name is now kubernetes. Generated client is moved to kubernetes/client folder and utils moved to kubernetes/util. The new way to use the client is:

from kubernetes import client
from kubernetes import util

util.load_kube_config()
v1 = client.CoreV1Api()

ref #23

[mbohlool]

@sebgoa I've rearrange things per our discussion in #23. Please note that after this PR merged, #13 is not applicable anymore as client README file is in its own folder.

[mbohlool]

This is too complicated to review. I will group changes in commits and assign you when it is ready.

[mbohlool]

Now that I separate each step in one commit, each of them look trivial and there are a lot of generated code. I will submit this one without review. Thanks.