Fixing to run with [email protected]+

As it was, this error raised:
    `Error: Use CoffeeScript.register() or require the coffee-script/register module to require .coffee.md files.`

GitHub user Maxtaco pointed out the [solution to the error here](maxtaco/coffee-script#138)
I quote 
  "This changed a while back with [email protected].  Check the main Coffee
  page, and here's the explanation:
   - When requiring CoffeeScript files in Node you must now explicitly
   register the compiler. This can be done with require
   'coffee-script/register' ..."

server.js

@@ -1,4 +1,4 @@
 require("coffee-script");
-
+require("coffee-script/register")
 var app = require("./app");
-app.listen(process.env.C9_PORT);
+app.listen(process.env.C9_PORT);