Merge pull request airbnb#7 from airbnb/bang_modules

Switched modules to bang-style.

README.md

@@ -1083,14 +1083,15 @@
 
 ## <a name='modules'>Modules</a>
 
+  - The module should start with a `!`. This ensures that if a malformed module forgets to include a final semicolon there aren't errors in production when the scripts get concatenated.
   - The file should be named with camelCase, live in a folder with the same name, and match the name of the single export.
   - Add a method called noConflict() that sets the exported module to the previous version.
   - Always declare `'use strict;'` at the top of the module.
 
     ```javascript
     // fancyInput/fancyInput.js
 
-    (function(global) {
+    !function(global) {
       'use strict';
 
       var previousFancyInput = global.FancyInput;
@@ -1104,7 +1105,7 @@
       };
 
       global.FancyInput = FancyInput;
-    })(this);
+    }(this);
     ```
 
     **[[⬆]](#TOC)**