Revert "stylus is not available yet in latest tilt"

This reverts commit 80b79c89eb.

README.md

@@ -832,8 +832,7 @@ template than for the layout by passing the `:layout_engine` option.
       </a> and a
       <a href="https://github.com/sstephenson/execjs/blob/master/README.md#readme" title="ExecJS">
         way to execute javascript
-      </a>, it also requires and as of yet unreleased version of
-      <a href="https://github.com/rtomayko/tilt">Tilt</a>
+      </a>
     </td>
   </tr>
   <tr>

test/stylus_test.rb

@@ -4,7 +4,7 @@ begin
   require 'stylus'
 
   begin
-    Tilt[:styl].new { "1" }.render
+    Stylus.compile '1'
   rescue RuntimeError
     raise LoadError, 'unable to find Stylus compiler'
   end