nginx-vhosts rewrite

docs/appendices/0.5.0-migration-guide.md

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+# 0.5.0 Migration Guide
+## nginx-vhosts
+- The nginx-vhosts template language is now [sigil](https://github.com/gliderlabs/sigil)
+  - No need to escape literal `$` characters (or other "bash-isms")
+  - Template variables are represented as {{ .VARIABLE_NAME }}
+  - A detailed list of template variables can be found [here](/dokku/nginx#available-template-variables)
+- A custom nginx-vhosts template must be named `nginx.conf.sigil`
+  - The default path for this custom template is the root of your repo (i.e. `/app` in the container or `WORKDIR` if defined in a dockerfile app)
+  - Dokku no longer looks for this file in `/home/dokku/myapp` on the dokku server
+  - Check out an example template [here](/dokku/nginx/)
+- Support for server-wide SSL certs have been dropped in favor of using the `certs` plugin
+  - `dokku certs:add myapp < certs.tar`
+- All domains for an SSL-enabled app will be redirected to https by default
+  - This can be overridden with a custom template
+- Replaced "magic" `NO_VHOST` variable with `domains:enable/disable`
+- Simplified zero downtime control
+  - `checks:enable/disable`
+## Dockerfile apps with multiple ports
+- Dockerfiles with multiple `EXPOSE` clauses will get all **tcp** ports proxied by default (nginx does not support proxying udp)
+  - UDP can be exposed by disabling the nginx proxy with `dokku proxy:disable myapp`