[DOC] Added information on the "multi_json" usage into README and web…

…site

README.markdown

@@ -52,6 +52,15 @@ To test-drive the core _ElasticSearch_ functionality, let's require the gem:
 Please note that you can copy these snippets from the much more extensive and heavily annotated file
 in [examples/tire-dsl.rb](http://karmi.github.com/tire/).
 
+Also, note that we're doing some heavy JSON lifting here. _Tire_ uses the
+[_multi_json_](https://github.com/intridea/multi_json) gem as a generic JSON wrapper,
+which allows you to use your preferred JSON library. We'll use the
+[_yajl-ruby_](https://github.com/brianmario/yajl-ruby) gem in the full on mode here:
+
+```ruby
+    require 'yajl/json_gem'
+```
+
 OK. Let's create an index named `articles` and store/index some documents:
 
 ```ruby

examples/tire-dsl.rb

@@ -26,6 +26,14 @@
 #     gem install tire
 #
 require 'rubygems'
+
+# _Tire_ uses the [_multi_json_](https://github.com/intridea/multi_json) gem as a generic JSON library.
+# We want to use the [_yajl-ruby_](https://github.com/brianmario/yajl-ruby) gem in its full on mode here.
+#
+require 'yajl/json_gem'
+
+# Now, let's require the _Tire_ gem itself, and we're ready to go.
+#
 require 'tire'
 
 #### Prerequisites