Fix typo

Fix wrong text for 'Guides' item in sidebar

Verification options for TLS 

Clean up consul earlier when destroying a task

Update K8S max nodes

Fix wrong link to GitHub project in sidebar

According to http://blog.kubernetes.io/2017/03/scalability-updates-in-kubernetes-1.6.html

Protect against nil job in new allocation

There should be just one option, verify_https_client, which
controls incoming and outgoing validation for the HTTPS wrapper

Job revert

Bumping up Vagrantfile's nomad version

Update constraint.html.md

Fix Distinct Constraint header