Releasing, exrm and ssl

https://dash.readme.io/project/phoenixframework/v1.1.4/suggested/update/5738581913fb8f0e00999b55

As I run into some errors with my release and ssl app, I thought I shared some insight. Might also apply to release with exrm section. But people who want to do ssl are propably more likely to look under the ssl section for troubleshooting, so suggesting it here.

-Milan Köpke

bonus_guides/P_using_ssl.md

@@ -26,3 +26,17 @@ Without the `otp_app:` key, we need to provide absolute paths to the files where
 ```elixir
 Path.expand("../../../some/path/to/ssl/key.pem", __DIR__)
 ```
+
+Releasing with Exrm:
+
+In order to build and run a release with exrm, make sure you also include the ssl app in `mix.exs`:
+
+```elixir
+def application do
+	[mod: {HelloPhoenix, []},
+	applications: [:phoenix, :phoenix_html, :cowboy, :logger, :gettext,
+                 :phoenix_ecto, :postgrex, :ssl]]
+end
+```
+
+Else you might run into errors: `** (MatchError) no match of right hand side value: {:error, {:ssl, {'no such file or directory', 'ssl.app'}}}`