Conver the error hook example to a release

examples/error_hook/README.md

@@ -1,22 +1,27 @@
-Cowboy Error Hook
-=================
+Error hook example
+==================
 
-To compile this example you need rebar in your PATH.
+To try this example, you need GNU `make`, `git` and
+[relx](https://github.com/erlware/relx) in your PATH.
 
-Type the following command:
-```
-$ rebar get-deps compile
+To build the example, run the following command:
+
+``` bash
+$ make
 ```
 
-You can then start the Erlang node with the following command:
-```
-./start.sh
+To start the release in the foreground:
+
+``` bash
+$ ./_rel/bin/error_hook_example console
 ```
 
-Then point your browser to the indicated URL.
+Then point your browser at [http://localhost:8080](http://localhost:8080).
 
-Example
--------
+Example output
+--------------
+
+Not found:
 
 ``` bash
 $ curl -i http://localhost:8080
@@ -28,3 +33,23 @@ content-length: 56
 
 404 Not Found: "/" is not the path you are looking for.
 ```
+
+Bad request:
+
+``` bash
+$ telnet localhost 8080
+Trying ::1...
+Connection failed: Connection refused
+Trying 127.0.0.1...
+Connected to localhost.
+Escape character is '^]'.
+bad
+HTTP/1.1 400 Bad Request
+connection: close
+server: Cowboy
+date: Sun, 08 Sep 2013 09:29:27 GMT
+content-length: 15
+
+HTTP Error 400
+Connection closed by foreign host.
+```