Fix configuration name
Check for expected versioning format in url
Update tests on version installations and checks
Add note about installation change
Make possible to skip running based by a node attribute

If you want to disable the updater you can set the `disabled`
attribute to true. This might be useful if the cookbook is added
to a role but should then be skipped for example on a Chef server.
Fix node attribute in an error message
Use warn level message when disabled via attribute
Add note to changelog about `disabled` attribute addition