Merge branch 'api-proxy' into 'master'

docs/reference.md

docs/reference.pdf

plugins/inventory/float.py

roles/float-infra-nginx/handlers/main.yml

roles/float-infra-nginx/tasks/api-proxy.yml

roles/float-infra-nginx/tasks/main.yml

roles/float-infra-nginx/tasks/nginx.yml

roles/float-infra-nginx/templates/api-proxy.yml.j2

roles/float-infra-nginx/templates/nginx-upstream.j2

roles/float-infra-nginx/templates/nginx-vhost.j2

roles/float-infra-nginx/templates/sso-proxy.yml.j2