Add example of reverse proxy with basic auth
Add example of reverse proxy with basic auth

This example covers:
- Generation of an htpasswd file from a login and password
- Use of bosh2 variables to feed SSL properties

pivotal-cf-experimental/nginx-bosh-release,cloudfoundry-community/nginx-release,pivotal-cf-experimental/nginx-bosh-release,cloudfoundry-community/nginx-release