Added link to a gist for loading handlebars templates (sync and async) in README.

Author: utsengar

README.markdown

@@ -336,6 +336,7 @@ Handlebars in the Wild
   structure your views, also with automatic data binding support.
 * Les Hill (@leshill) wrote a Rails Asset Pipeline gem named
   handlebars_assets](http://github.com/leshill/handlebars_assets).
+* [Gist about Synchronous and asynchronous loading of external handlebars templates](https://gist.github.com/2287070)
 
 Helping Out
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