Updated less and sass gem instructions according to fontawesome-less and fontawesome-sass READMEs

Fixes #3883

src/get-started.html

@@ -81,13 +81,19 @@ $ gem install font-awesome-less
 {% endhighlight %}
       </li>
     </ol>
+    <p>
+    If you use Rails, add this to your e.g. <code>application.css</code>, just before <code>*= require_self</code>:
+    </p>
+{% highlight css %}
+ *= require font-awesome
+{% endhighlight %}
   </section>
 
   <section id="ruby-gem-sass">
     <h2 class="page-header">EASY: <a href="https://github.com/FortAwesome/font-awesome-sass">SASS Ruby Gem</a></h2>
     <p>
       Use the <a href="https://github.com/FortAwesome/font-awesome-sass">Official Font Awesome SASS Ruby Gem</a> to easily get Font
-      Awesome SASS into a Rails project. Generously maintained by <a href="https://twitter.com/supercodepoet/">@supercodepoet</a>.
+      Awesome SASS into a Rails or Compass project. Generously maintained by <a href="https://twitter.com/supercodepoet/">@supercodepoet</a>.
     </p>
     <ol>
       <li>
@@ -108,6 +114,12 @@ $ gem install font-awesome-sass
 {% endhighlight %}
       </li>
     </ol>
+    <p>
+    If you use Rails, add this to your e.g. <code>application.css</code>, just before <code>*= require_self</code>:
+    </p>
+{% highlight css %}
+ *= require font-awesome
+{% endhighlight %}
   </section>
 
   <section id="custom-less">