Fix typo

Travis build status link should go to master

Currently it goes to the latest Pull Request

* Adding cleanup CI scripts to source control

* cleanup

* spelling

* small fixes

* Improve minikube help output by grouping into categories

* consistant colon

* Add configuration category to grouped commands

Upgrade the build image from 1.12.5 to 1.12.7

Fix glog parse error

I've been seeing errors like `Error running command: -p=TestPersistence start --vm-driver=hyperv --hyperv-virtual-switch=primary-virtual-switch --bootstrapper=kubeadm--wait=false --v=10 --logtostderr  --alsologtostderr --v=2 . Output: * minikube v1.2.0 on windows (amd64)` in my hyperV testing which means we need an extra space here.

Switch documentation site to docsy theme, add sample content

hyperv: Run "sudo poweroff" before stopping VM

CI: clean up stale hyperkit and none process and stale inaccessible vbox

Update link to Steve Sloka's article

Upgrade nginx ingress to 0.25.0

Update common.sh

Update common.sh